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15=10v-7v
We move all terms to the left:
15-(10v-7v)=0
We add all the numbers together, and all the variables
-(+3v)+15=0
We get rid of parentheses
-3v+15=0
We move all terms containing v to the left, all other terms to the right
-3v=-15
v=-15/-3
v=+5
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