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99=12+3t
We move all terms to the left:
99-(12+3t)=0
We add all the numbers together, and all the variables
-(3t+12)+99=0
We get rid of parentheses
-3t-12+99=0
We add all the numbers together, and all the variables
-3t+87=0
We move all terms containing t to the left, all other terms to the right
-3t=-87
t=-87/-3
t=+29
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