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-(t-1)=15
We move all terms to the left:
-(t-1)-(15)=0
We get rid of parentheses
-t+1-15=0
We add all the numbers together, and all the variables
-1t-14=0
We move all terms containing t to the left, all other terms to the right
-t=14
t=14/-1
t=-14
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