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3=20+v
We move all terms to the left:
3-(20+v)=0
We add all the numbers together, and all the variables
-(v+20)+3=0
We get rid of parentheses
-v-20+3=0
We add all the numbers together, and all the variables
-1v-17=0
We move all terms containing v to the left, all other terms to the right
-v=17
v=17/-1
v=-17
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