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-13=-5w+8(w-5)
We move all terms to the left:
-13-(-5w+8(w-5))=0
We calculate terms in parentheses: -(-5w+8(w-5)), so:We get rid of parentheses
-5w+8(w-5)
We multiply parentheses
-5w+8w-40
We add all the numbers together, and all the variables
3w-40
Back to the equation:
-(3w-40)
-3w+40-13=0
We add all the numbers together, and all the variables
-3w+27=0
We move all terms containing w to the left, all other terms to the right
-3w=-27
w=-27/-3
w=+9
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