Solve for t
t=4
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-20t+80=0
Swap sides so that all variable terms are on the left hand side.
-20t=-80
Subtract 80 from both sides. Anything subtracted from zero gives its negation.
t=\frac{-80}{-20}
Divide both sides by -20.
t=4
Divide -80 by -20 to get 4.
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