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21=v/2+16
We move all terms to the left:
21-(v/2+16)=0
We get rid of parentheses
-v/2-16+21=0
We multiply all the terms by the denominator
-v-16*2+21*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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