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170=21-v
We move all terms to the left:
170-(21-v)=0
We add all the numbers together, and all the variables
-(-1v+21)+170=0
We get rid of parentheses
1v-21+170=0
We add all the numbers together, and all the variables
v+149=0
We move all terms containing v to the left, all other terms to the right
v=-149
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