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-9(t+80)=9
We move all terms to the left:
-9(t+80)-(9)=0
We multiply parentheses
-9t-720-9=0
We add all the numbers together, and all the variables
-9t-729=0
We move all terms containing t to the left, all other terms to the right
-9t=729
t=729/-9
t=-81
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