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-4-8t=-7t
We move all terms to the left:
-4-8t-(-7t)=0
We get rid of parentheses
-8t+7t-4=0
We add all the numbers together, and all the variables
-1t-4=0
We move all terms containing t to the left, all other terms to the right
-t=4
t=4/-1
t=-4
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