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-3(4t+5)=81
We move all terms to the left:
-3(4t+5)-(81)=0
We multiply parentheses
-12t-15-81=0
We add all the numbers together, and all the variables
-12t-96=0
We move all terms containing t to the left, all other terms to the right
-12t=96
t=96/-12
t=-8
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