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-15v-23=-4(2v-10)
We move all terms to the left:
-15v-23-(-4(2v-10))=0
We calculate terms in parentheses: -(-4(2v-10)), so:We get rid of parentheses
-4(2v-10)
We multiply parentheses
-8v+40
Back to the equation:
-(-8v+40)
-15v+8v-40-23=0
We add all the numbers together, and all the variables
-7v-63=0
We move all terms containing v to the left, all other terms to the right
-7v=63
v=63/-7
v=-9
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