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12-3v=4-2v
We move all terms to the left:
12-3v-(4-2v)=0
We add all the numbers together, and all the variables
-3v-(-2v+4)+12=0
We get rid of parentheses
-3v+2v-4+12=0
We add all the numbers together, and all the variables
-1v+8=0
We move all terms containing v to the left, all other terms to the right
-v=-8
v=-8/-1
v=+8
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