Texas Rangers First-Place Eliminiation Scenario
Texas must win 26 more games (27 total) to avoid elimination from first place.
Here are the final standings in a scenario in which Texas finishes in first place with 27 wins:

Team             W	L	PCT	GB
Texas            27	135	0.167	0.00
Seattle          27	135	0.167	0.00
Los Angeles      27	135	0.167	0.00
Houston          26	136	0.160	1.00
Oakland          25	137	0.154	2.00

Tie breakers
Texas wins the series with Los Angeles 7 games to 6
Texas wins the series with Seattle 10 games to 3

To construct the scenario, we start with the current standings in the division:
Team             W	L	GL	PCT	GB
Oakland          1	0	161	1.000	0.0
Seattle          1	0	161	1.000	0.0
Texas            1	0	161	1.000	0.0
Houston          0	1	161	0.000	1.0
Los Angeles      0	1	161	0.000	1.0

Next, we show how the remaining series of games plays out in the scenario:

Houston currently has 0 win(s) against Los Angeles and 0 loss(es).
Houston wins 0 additional game(s) against Los Angeles and loses 13.
Houston loses the series 0 games to 13.
Houston wins 0 additional game(s) against teams outside the division and loses 109.

Houston currently has 0 win(s) against Oakland and 0 loss(es).
Houston wins 8 additional game(s) against Oakland and loses 5.
Houston wins the series 8 games to 5.
Houston wins 0 additional game(s) against teams outside the division and loses 109.

Houston currently has 0 win(s) against Seattle and 0 loss(es).
Houston wins 13 additional game(s) against Seattle and loses 0.
Houston wins the series 13 games to 0.
Houston wins 0 additional game(s) against teams outside the division and loses 109.

Houston currently has 0 win(s) against Texas and 0 loss(es).
Houston wins 5 additional game(s) against Texas and loses 8.
Houston loses the series 5 games to 8.
Houston wins 0 additional game(s) against teams outside the division and loses 109.

Los Angeles currently has 0 win(s) against Oakland and 1 loss(es).
Los Angeles wins 5 additional game(s) against Oakland and loses 7.
Los Angeles loses the series 5 games to 8.
Los Angeles wins 0 additional game(s) against teams outside the division and loses 110.

Los Angeles currently has 0 win(s) against Seattle and 0 loss(es).
Los Angeles wins 3 additional game(s) against Seattle and loses 10.
Los Angeles loses the series 3 games to 10.
Los Angeles wins 0 additional game(s) against teams outside the division and loses 110.

Los Angeles currently has 0 win(s) against Texas and 0 loss(es).
Los Angeles wins 6 additional game(s) against Texas and loses 7.
Los Angeles loses the series 6 games to 7.
Los Angeles wins 0 additional game(s) against teams outside the division and loses 110.

Oakland currently has 0 win(s) against Seattle and 0 loss(es).
Oakland wins 0 additional game(s) against Seattle and loses 13.
Oakland loses the series 0 games to 13.
Oakland wins 0 additional game(s) against teams outside the division and loses 110.

Oakland currently has 0 win(s) against Texas and 0 loss(es).
Oakland wins 12 additional game(s) against Texas and loses 1.
Oakland wins the series 12 games to 1.
Oakland wins 0 additional game(s) against teams outside the division and loses 110.

Seattle currently has 0 win(s) against Texas and 0 loss(es).
Seattle wins 3 additional game(s) against Texas and loses 10.
Seattle loses the series 3 games to 10.
Seattle wins 0 additional game(s) against teams outside the division and loses 109.

# Texas Rangers' magic number
# Texas's magic number
# Rangers' magic number
# MLB Playoff Race