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15=-5(w+9)
We move all terms to the left:
15-(-5(w+9))=0
We calculate terms in parentheses: -(-5(w+9)), so:We get rid of parentheses
-5(w+9)
We multiply parentheses
-5w-45
Back to the equation:
-(-5w-45)
5w+45+15=0
We add all the numbers together, and all the variables
5w+60=0
We move all terms containing w to the left, all other terms to the right
5w=-60
w=-60/5
w=-12
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