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30+2v=4v+18
We move all terms to the left:
30+2v-(4v+18)=0
We get rid of parentheses
2v-4v-18+30=0
We add all the numbers together, and all the variables
-2v+12=0
We move all terms containing v to the left, all other terms to the right
-2v=-12
v=-12/-2
v=+6
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