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-78=-6(v+9)
We move all terms to the left:
-78-(-6(v+9))=0
We calculate terms in parentheses: -(-6(v+9)), so:We get rid of parentheses
-6(v+9)
We multiply parentheses
-6v-54
Back to the equation:
-(-6v-54)
6v+54-78=0
We add all the numbers together, and all the variables
6v-24=0
We move all terms containing v to the left, all other terms to the right
6v=24
v=24/6
v=4
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