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2w-9=-5(w-8)
We move all terms to the left:
2w-9-(-5(w-8))=0
We calculate terms in parentheses: -(-5(w-8)), so:We get rid of parentheses
-5(w-8)
We multiply parentheses
-5w+40
Back to the equation:
-(-5w+40)
2w+5w-40-9=0
We add all the numbers together, and all the variables
7w-49=0
We move all terms containing w to the left, all other terms to the right
7w=49
w=49/7
w=7
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