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4v-9=2v+9
We move all terms to the left:
4v-9-(2v+9)=0
We get rid of parentheses
4v-2v-9-9=0
We add all the numbers together, and all the variables
2v-18=0
We move all terms containing v to the left, all other terms to the right
2v=18
v=18/2
v=9
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