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10-(w+18)=9
We move all terms to the left:
10-(w+18)-(9)=0
We add all the numbers together, and all the variables
-(w+18)+1=0
We get rid of parentheses
-w-18+1=0
We add all the numbers together, and all the variables
-1w-17=0
We move all terms containing w to the left, all other terms to the right
-w=17
w=17/-1
w=-17
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