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-4w-18=-9(w+7)
We move all terms to the left:
-4w-18-(-9(w+7))=0
We calculate terms in parentheses: -(-9(w+7)), so:We get rid of parentheses
-9(w+7)
We multiply parentheses
-9w-63
Back to the equation:
-(-9w-63)
-4w+9w+63-18=0
We add all the numbers together, and all the variables
5w+45=0
We move all terms containing w to the left, all other terms to the right
5w=-45
w=-45/5
w=-9
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