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13=v/2+6
We move all terms to the left:
13-(v/2+6)=0
We get rid of parentheses
-v/2-6+13=0
We multiply all the terms by the denominator
-v-6*2+13*2=0
We add all the numbers together, and all the variables
-1v+14=0
We move all terms containing v to the left, all other terms to the right
-v=-14
v=-14/-1
v=+14
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