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-9t=-8t-7
We move all terms to the left:
-9t-(-8t-7)=0
We get rid of parentheses
-9t+8t+7=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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