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90=5(w+3)
We move all terms to the left:
90-(5(w+3))=0
We calculate terms in parentheses: -(5(w+3)), so:We get rid of parentheses
5(w+3)
We multiply parentheses
5w+15
Back to the equation:
-(5w+15)
-5w-15+90=0
We add all the numbers together, and all the variables
-5w+75=0
We move all terms containing w to the left, all other terms to the right
-5w=-75
w=-75/-5
w=+15
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