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-13+3v=-7+v
We move all terms to the left:
-13+3v-(-7+v)=0
We add all the numbers together, and all the variables
3v-(v-7)-13=0
We get rid of parentheses
3v-v+7-13=0
We add all the numbers together, and all the variables
2v-6=0
We move all terms containing v to the left, all other terms to the right
2v=6
v=6/2
v=3
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