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12v+18=10v-20
We move all terms to the left:
12v+18-(10v-20)=0
We get rid of parentheses
12v-10v+20+18=0
We add all the numbers together, and all the variables
2v+38=0
We move all terms containing v to the left, all other terms to the right
2v=-38
v=-38/2
v=-19
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