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90=5(4-2v)
We move all terms to the left:
90-(5(4-2v))=0
We add all the numbers together, and all the variables
-(5(-2v+4))+90=0
We calculate terms in parentheses: -(5(-2v+4)), so:We get rid of parentheses
5(-2v+4)
We multiply parentheses
-10v+20
Back to the equation:
-(-10v+20)
10v-20+90=0
We add all the numbers together, and all the variables
10v+70=0
We move all terms containing v to the left, all other terms to the right
10v=-70
v=-70/10
v=-7
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