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20=4v+8
We move all terms to the left:
20-(4v+8)=0
We get rid of parentheses
-4v-8+20=0
We add all the numbers together, and all the variables
-4v+12=0
We move all terms containing v to the left, all other terms to the right
-4v=-12
v=-12/-4
v=+3
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