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7w-13=-5(w-7)
We move all terms to the left:
7w-13-(-5(w-7))=0
We calculate terms in parentheses: -(-5(w-7)), so:We get rid of parentheses
-5(w-7)
We multiply parentheses
-5w+35
Back to the equation:
-(-5w+35)
7w+5w-35-13=0
We add all the numbers together, and all the variables
12w-48=0
We move all terms containing w to the left, all other terms to the right
12w=48
w=48/12
w=4
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