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-7=-15+2V
We move all terms to the left:
-7-(-15+2V)=0
We add all the numbers together, and all the variables
-(2V-15)-7=0
We get rid of parentheses
-2V+15-7=0
We add all the numbers together, and all the variables
-2V+8=0
We move all terms containing V to the left, all other terms to the right
-2V=-8
V=-8/-2
V=+4
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