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13=3+v/2
We move all terms to the left:
13-(3+v/2)=0
We add all the numbers together, and all the variables
-(v/2+3)+13=0
We get rid of parentheses
-v/2-3+13=0
We multiply all the terms by the denominator
-v-3*2+13*2=0
We add all the numbers together, and all the variables
-1v+20=0
We move all terms containing v to the left, all other terms to the right
-v=-20
v=-20/-1
v=+20
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