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80=5(w-4)
We move all terms to the left:
80-(5(w-4))=0
We calculate terms in parentheses: -(5(w-4)), so:We get rid of parentheses
5(w-4)
We multiply parentheses
5w-20
Back to the equation:
-(5w-20)
-5w+20+80=0
We add all the numbers together, and all the variables
-5w+100=0
We move all terms containing w to the left, all other terms to the right
-5w=-100
w=-100/-5
w=+20
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