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18=v/2+4
We move all terms to the left:
18-(v/2+4)=0
We get rid of parentheses
-v/2-4+18=0
We multiply all the terms by the denominator
-v-4*2+18*2=0
We add all the numbers together, and all the variables
-1v+28=0
We move all terms containing v to the left, all other terms to the right
-v=-28
v=-28/-1
v=+28
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