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9v-45=-2(v-5)
We move all terms to the left:
9v-45-(-2(v-5))=0
We calculate terms in parentheses: -(-2(v-5)), so:We get rid of parentheses
-2(v-5)
We multiply parentheses
-2v+10
Back to the equation:
-(-2v+10)
9v+2v-10-45=0
We add all the numbers together, and all the variables
11v-55=0
We move all terms containing v to the left, all other terms to the right
11v=55
v=55/11
v=5
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