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88=81+t
We move all terms to the left:
88-(81+t)=0
We add all the numbers together, and all the variables
-(t+81)+88=0
We get rid of parentheses
-t-81+88=0
We add all the numbers together, and all the variables
-1t+7=0
We move all terms containing t to the left, all other terms to the right
-t=-7
t=-7/-1
t=+7
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