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87=12t+3
We move all terms to the left:
87-(12t+3)=0
We get rid of parentheses
-12t-3+87=0
We add all the numbers together, and all the variables
-12t+84=0
We move all terms containing t to the left, all other terms to the right
-12t=-84
t=-84/-12
t=+7
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