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72=17v-9v
We move all terms to the left:
72-(17v-9v)=0
We add all the numbers together, and all the variables
-(+8v)+72=0
We get rid of parentheses
-8v+72=0
We move all terms containing v to the left, all other terms to the right
-8v=-72
v=-72/-8
v=+9
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