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-3-4v=-15-3v
We move all terms to the left:
-3-4v-(-15-3v)=0
We add all the numbers together, and all the variables
-4v-(-3v-15)-3=0
We get rid of parentheses
-4v+3v+15-3=0
We add all the numbers together, and all the variables
-1v+12=0
We move all terms containing v to the left, all other terms to the right
-v=-12
v=-12/-1
v=+12
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