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-w+18=-20+w
We move all terms to the left:
-w+18-(-20+w)=0
We add all the numbers together, and all the variables
-w-(w-20)+18=0
We add all the numbers together, and all the variables
-1w-(w-20)+18=0
We get rid of parentheses
-1w-w+20+18=0
We add all the numbers together, and all the variables
-2w+38=0
We move all terms containing w to the left, all other terms to the right
-2w=-38
w=-38/-2
w=+19
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