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251=121-v
We move all terms to the left:
251-(121-v)=0
We add all the numbers together, and all the variables
-(-1v+121)+251=0
We get rid of parentheses
1v-121+251=0
We add all the numbers together, and all the variables
v+130=0
We move all terms containing v to the left, all other terms to the right
v=-130
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