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-4=v/2-9
We move all terms to the left:
-4-(v/2-9)=0
We get rid of parentheses
-v/2+9-4=0
We multiply all the terms by the denominator
-v+9*2-4*2=0
We add all the numbers together, and all the variables
-1v+10=0
We move all terms containing v to the left, all other terms to the right
-v=-10
v=-10/-1
v=+10
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