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13=2v-7
We move all terms to the left:
13-(2v-7)=0
We get rid of parentheses
-2v+7+13=0
We add all the numbers together, and all the variables
-2v+20=0
We move all terms containing v to the left, all other terms to the right
-2v=-20
v=-20/-2
v=+10
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