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