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-21=4+5w
We move all terms to the left:
-21-(4+5w)=0
We add all the numbers together, and all the variables
-(5w+4)-21=0
We get rid of parentheses
-5w-4-21=0
We add all the numbers together, and all the variables
-5w-25=0
We move all terms containing w to the left, all other terms to the right
-5w=25
w=25/-5
w=-5
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