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231=181-v
We move all terms to the left:
231-(181-v)=0
We add all the numbers together, and all the variables
-(-1v+181)+231=0
We get rid of parentheses
1v-181+231=0
We add all the numbers together, and all the variables
v+50=0
We move all terms containing v to the left, all other terms to the right
v=-50
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