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13=1-2v+5v
We move all terms to the left:
13-(1-2v+5v)=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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