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15=2t-65
We move all terms to the left:
15-(2t-65)=0
We get rid of parentheses
-2t+65+15=0
We add all the numbers together, and all the variables
-2t+80=0
We move all terms containing t to the left, all other terms to the right
-2t=-80
t=-80/-2
t=+40
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