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9=9(w-9)
We move all terms to the left:
9-(9(w-9))=0
We calculate terms in parentheses: -(9(w-9)), so:We get rid of parentheses
9(w-9)
We multiply parentheses
9w-81
Back to the equation:
-(9w-81)
-9w+81+9=0
We add all the numbers together, and all the variables
-9w+90=0
We move all terms containing w to the left, all other terms to the right
-9w=-90
w=-90/-9
w=+10
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