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84=w/4+75
We move all terms to the left:
84-(w/4+75)=0
We get rid of parentheses
-w/4-75+84=0
We multiply all the terms by the denominator
-w-75*4+84*4=0
We add all the numbers together, and all the variables
-1w+36=0
We move all terms containing w to the left, all other terms to the right
-w=-36
w=-36/-1
w=+36
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