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206=81-v
We move all terms to the left:
206-(81-v)=0
We add all the numbers together, and all the variables
-(-1v+81)+206=0
We get rid of parentheses
1v-81+206=0
We add all the numbers together, and all the variables
v+125=0
We move all terms containing v to the left, all other terms to the right
v=-125
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