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-8=-12-t
We move all terms to the left:
-8-(-12-t)=0
We add all the numbers together, and all the variables
-(-1t-12)-8=0
We get rid of parentheses
1t+12-8=0
We add all the numbers together, and all the variables
t+4=0
We move all terms containing t to the left, all other terms to the right
t=-4
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