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-12v=2v+5v+2v
We move all terms to the left:
-12v-(2v+5v+2v)=0
We add all the numbers together, and all the variables
-12v-(+9v)=0
We get rid of parentheses
-12v-9v=0
We add all the numbers together, and all the variables
-21v=0
v=0/-21
v=0
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