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28=-7w+5(w+4)
We move all terms to the left:
28-(-7w+5(w+4))=0
We calculate terms in parentheses: -(-7w+5(w+4)), so:We get rid of parentheses
-7w+5(w+4)
We multiply parentheses
-7w+5w+20
We add all the numbers together, and all the variables
-2w+20
Back to the equation:
-(-2w+20)
2w-20+28=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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