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159=20-v
We move all terms to the left:
159-(20-v)=0
We add all the numbers together, and all the variables
-(-1v+20)+159=0
We get rid of parentheses
1v-20+159=0
We add all the numbers together, and all the variables
v+139=0
We move all terms containing v to the left, all other terms to the right
v=-139
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