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90=3w+10w
We move all terms to the left:
90-(3w+10w)=0
We add all the numbers together, and all the variables
-(+13w)+90=0
We get rid of parentheses
-13w+90=0
We move all terms containing w to the left, all other terms to the right
-13w=-90
w=-90/-13
w=6+12/13
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