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13=1-3v
We move all terms to the left:
13-(1-3v)=0
We add all the numbers together, and all the variables
-(-3v+1)+13=0
We get rid of parentheses
3v-1+13=0
We add all the numbers together, and all the variables
3v+12=0
We move all terms containing v to the left, all other terms to the right
3v=-12
v=-12/3
v=-4
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