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-15=w/4+5
We move all terms to the left:
-15-(w/4+5)=0
We get rid of parentheses
-w/4-5-15=0
We multiply all the terms by the denominator
-w-5*4-15*4=0
We add all the numbers together, and all the variables
-1w-80=0
We move all terms containing w to the left, all other terms to the right
-w=80
w=80/-1
w=-80
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