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8v-31=-9(v-6)
We move all terms to the left:
8v-31-(-9(v-6))=0
We calculate terms in parentheses: -(-9(v-6)), so:We get rid of parentheses
-9(v-6)
We multiply parentheses
-9v+54
Back to the equation:
-(-9v+54)
8v+9v-54-31=0
We add all the numbers together, and all the variables
17v-85=0
We move all terms containing v to the left, all other terms to the right
17v=85
v=85/17
v=5
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