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90=4w+4
We move all terms to the left:
90-(4w+4)=0
We get rid of parentheses
-4w-4+90=0
We add all the numbers together, and all the variables
-4w+86=0
We move all terms containing w to the left, all other terms to the right
-4w=-86
w=-86/-4
w=21+1/2
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