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-(t+7)=23
We move all terms to the left:
-(t+7)-(23)=0
We get rid of parentheses
-t-7-23=0
We add all the numbers together, and all the variables
-1t-30=0
We move all terms containing t to the left, all other terms to the right
-t=30
t=30/-1
t=-30
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