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150=-v+221
We move all terms to the left:
150-(-v+221)=0
We add all the numbers together, and all the variables
-(-1v+221)+150=0
We get rid of parentheses
1v-221+150=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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