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15-(2v+3)=2v-12
We move all terms to the left:
15-(2v+3)-(2v-12)=0
We get rid of parentheses
-2v-2v-3+12+15=0
We add all the numbers together, and all the variables
-4v+24=0
We move all terms containing v to the left, all other terms to the right
-4v=-24
v=-24/-4
v=+6
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