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15=13v-8v
We move all terms to the left:
15-(13v-8v)=0
We add all the numbers together, and all the variables
-(+5v)+15=0
We get rid of parentheses
-5v+15=0
We move all terms containing v to the left, all other terms to the right
-5v=-15
v=-15/-5
v=+3
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