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-5w+13=-3(w-7)
We move all terms to the left:
-5w+13-(-3(w-7))=0
We calculate terms in parentheses: -(-3(w-7)), so:We get rid of parentheses
-3(w-7)
We multiply parentheses
-3w+21
Back to the equation:
-(-3w+21)
-5w+3w-21+13=0
We add all the numbers together, and all the variables
-2w-8=0
We move all terms containing w to the left, all other terms to the right
-2w=8
w=8/-2
w=-4
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