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90.4=13.5w+63.4
We move all terms to the left:
90.4-(13.5w+63.4)=0
We get rid of parentheses
-13.5w-63.4+90.4=0
We add all the numbers together, and all the variables
-13.5w+27=0
We move all terms containing w to the left, all other terms to the right
-13.5w=-27
w=-27/-13.5
w=+2
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