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13=-6+v
We move all terms to the left:
13-(-6+v)=0
We add all the numbers together, and all the variables
-(v-6)+13=0
We get rid of parentheses
-v+6+13=0
We add all the numbers together, and all the variables
-1v+19=0
We move all terms containing v to the left, all other terms to the right
-v=-19
v=-19/-1
v=+19
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