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8t-45=t+39
We move all terms to the left:
8t-45-(t+39)=0
We get rid of parentheses
8t-t-39-45=0
We add all the numbers together, and all the variables
7t-84=0
We move all terms containing t to the left, all other terms to the right
7t=84
t=84/7
t=12
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