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13=-6v-7v
We move all terms to the left:
13-(-6v-7v)=0
We add all the numbers together, and all the variables
-(-13v)+13=0
We get rid of parentheses
13v+13=0
We move all terms containing v to the left, all other terms to the right
13v=-13
v=-13/13
v=-1
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