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12=6v+18-9v
We move all terms to the left:
12-(6v+18-9v)=0
We add all the numbers together, and all the variables
-(-3v+18)+12=0
We get rid of parentheses
3v-18+12=0
We add all the numbers together, and all the variables
3v-6=0
We move all terms containing v to the left, all other terms to the right
3v=6
v=6/3
v=2
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