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-28=-8v+6(v-7)
We move all terms to the left:
-28-(-8v+6(v-7))=0
We calculate terms in parentheses: -(-8v+6(v-7)), so:We get rid of parentheses
-8v+6(v-7)
We multiply parentheses
-8v+6v-42
We add all the numbers together, and all the variables
-2v-42
Back to the equation:
-(-2v-42)
2v+42-28=0
We add all the numbers together, and all the variables
2v+14=0
We move all terms containing v to the left, all other terms to the right
2v=-14
v=-14/2
v=-7
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