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-2w-23=-7(w+9)
We move all terms to the left:
-2w-23-(-7(w+9))=0
We calculate terms in parentheses: -(-7(w+9)), so:We get rid of parentheses
-7(w+9)
We multiply parentheses
-7w-63
Back to the equation:
-(-7w-63)
-2w+7w+63-23=0
We add all the numbers together, and all the variables
5w+40=0
We move all terms containing w to the left, all other terms to the right
5w=-40
w=-40/5
w=-8
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