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221=151-v
We move all terms to the left:
221-(151-v)=0
We add all the numbers together, and all the variables
-(-1v+151)+221=0
We get rid of parentheses
1v-151+221=0
We add all the numbers together, and all the variables
v+70=0
We move all terms containing v to the left, all other terms to the right
v=-70
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