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90=6(w-72)
We move all terms to the left:
90-(6(w-72))=0
We calculate terms in parentheses: -(6(w-72)), so:We get rid of parentheses
6(w-72)
We multiply parentheses
6w-432
Back to the equation:
-(6w-432)
-6w+432+90=0
We add all the numbers together, and all the variables
-6w+522=0
We move all terms containing w to the left, all other terms to the right
-6w=-522
w=-522/-6
w=+87
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