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213=12-v
We move all terms to the left:
213-(12-v)=0
We add all the numbers together, and all the variables
-(-1v+12)+213=0
We get rid of parentheses
1v-12+213=0
We add all the numbers together, and all the variables
v+201=0
We move all terms containing v to the left, all other terms to the right
v=-201
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