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99=8t+3
We move all terms to the left:
99-(8t+3)=0
We get rid of parentheses
-8t-3+99=0
We add all the numbers together, and all the variables
-8t+96=0
We move all terms containing t to the left, all other terms to the right
-8t=-96
t=-96/-8
t=+12
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