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8w-30=-9(w-8)
We move all terms to the left:
8w-30-(-9(w-8))=0
We calculate terms in parentheses: -(-9(w-8)), so:We get rid of parentheses
-9(w-8)
We multiply parentheses
-9w+72
Back to the equation:
-(-9w+72)
8w+9w-72-30=0
We add all the numbers together, and all the variables
17w-102=0
We move all terms containing w to the left, all other terms to the right
17w=102
w=102/17
w=6
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