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8v-9=12v-17
We move all terms to the left:
8v-9-(12v-17)=0
We get rid of parentheses
8v-12v+17-9=0
We add all the numbers together, and all the variables
-4v+8=0
We move all terms containing v to the left, all other terms to the right
-4v=-8
v=-8/-4
v=+2
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