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-81=-7(v+7)+3v
We move all terms to the left:
-81-(-7(v+7)+3v)=0
We calculate terms in parentheses: -(-7(v+7)+3v), so:We get rid of parentheses
-7(v+7)+3v
We add all the numbers together, and all the variables
3v-7(v+7)
We multiply parentheses
3v-7v-49
We add all the numbers together, and all the variables
-4v-49
Back to the equation:
-(-4v-49)
4v+49-81=0
We add all the numbers together, and all the variables
4v-32=0
We move all terms containing v to the left, all other terms to the right
4v=32
v=32/4
v=8
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