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7=4v-9
We move all terms to the left:
7-(4v-9)=0
We get rid of parentheses
-4v+9+7=0
We add all the numbers together, and all the variables
-4v+16=0
We move all terms containing v to the left, all other terms to the right
-4v=-16
v=-16/-4
v=+4
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