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54=12v-3v
We move all terms to the left:
54-(12v-3v)=0
We add all the numbers together, and all the variables
-(+9v)+54=0
We get rid of parentheses
-9v+54=0
We move all terms containing v to the left, all other terms to the right
-9v=-54
v=-54/-9
v=+6
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