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20=v/2-12
We move all terms to the left:
20-(v/2-12)=0
We get rid of parentheses
-v/2+12+20=0
We multiply all the terms by the denominator
-v+12*2+20*2=0
We add all the numbers together, and all the variables
-1v+64=0
We move all terms containing v to the left, all other terms to the right
-v=-64
v=-64/-1
v=+64
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