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-28=5w-8
We move all terms to the left:
-28-(5w-8)=0
We get rid of parentheses
-5w+8-28=0
We add all the numbers together, and all the variables
-5w-20=0
We move all terms containing w to the left, all other terms to the right
-5w=20
w=20/-5
w=-4
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