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225=90+(25+9)w
We move all terms to the left:
225-(90+(25+9)w)=0
We add all the numbers together, and all the variables
-(90+34w)+225=0
We get rid of parentheses
-34w-90+225=0
We add all the numbers together, and all the variables
-34w+135=0
We move all terms containing w to the left, all other terms to the right
-34w=-135
w=-135/-34
w=3+33/34
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