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2v-8=-8(v-9)
We move all terms to the left:
2v-8-(-8(v-9))=0
We calculate terms in parentheses: -(-8(v-9)), so:We get rid of parentheses
-8(v-9)
We multiply parentheses
-8v+72
Back to the equation:
-(-8v+72)
2v+8v-72-8=0
We add all the numbers together, and all the variables
10v-80=0
We move all terms containing v to the left, all other terms to the right
10v=80
v=80/10
v=8
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