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(V)=7000V+4000
We move all terms to the left:
(V)-(7000V+4000)=0
We get rid of parentheses
V-7000V-4000=0
We add all the numbers together, and all the variables
-6999V-4000=0
We move all terms containing V to the left, all other terms to the right
-6999V=4000
V=4000/-6999
V=-4000/6999
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