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12=83-v
We move all terms to the left:
12-(83-v)=0
We add all the numbers together, and all the variables
-(-1v+83)+12=0
We get rid of parentheses
1v-83+12=0
We add all the numbers together, and all the variables
v-71=0
We move all terms containing v to the left, all other terms to the right
v=71
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