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12=v/4-13
We move all terms to the left:
12-(v/4-13)=0
We get rid of parentheses
-v/4+13+12=0
We multiply all the terms by the denominator
-v+13*4+12*4=0
We add all the numbers together, and all the variables
-1v+100=0
We move all terms containing v to the left, all other terms to the right
-v=-100
v=-100/-1
v=+100
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