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15=3t-6
We move all terms to the left:
15-(3t-6)=0
We get rid of parentheses
-3t+6+15=0
We add all the numbers together, and all the variables
-3t+21=0
We move all terms containing t to the left, all other terms to the right
-3t=-21
t=-21/-3
t=+7
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