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4=2v-4
We move all terms to the left:
4-(2v-4)=0
We get rid of parentheses
-2v+4+4=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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