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7-5v=-7v+9
We move all terms to the left:
7-5v-(-7v+9)=0
We get rid of parentheses
-5v+7v-9+7=0
We add all the numbers together, and all the variables
2v-2=0
We move all terms containing v to the left, all other terms to the right
2v=2
v=2/2
v=1
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