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13=2t+7
We move all terms to the left:
13-(2t+7)=0
We get rid of parentheses
-2t-7+13=0
We add all the numbers together, and all the variables
-2t+6=0
We move all terms containing t to the left, all other terms to the right
-2t=-6
t=-6/-2
t=+3
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