Solve for t
t>40
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-20t<400-1200
Subtract 1200 from both sides.
-20t<-800
Subtract 1200 from 400 to get -800.
t>\frac{-800}{-20}
Divide both sides by -20. Since -20 is negative, the inequality direction is changed.
t>40
Divide -800 by -20 to get 40.
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