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-20-12v=1-13v-2v
We move all terms to the left:
-20-12v-(1-13v-2v)=0
We add all the numbers together, and all the variables
-12v-(-15v+1)-20=0
We get rid of parentheses
-12v+15v-1-20=0
We add all the numbers together, and all the variables
3v-21=0
We move all terms containing v to the left, all other terms to the right
3v=21
v=21/3
v=7
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