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-15=3v-6v
We move all terms to the left:
-15-(3v-6v)=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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