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215=125-w
We move all terms to the left:
215-(125-w)=0
We add all the numbers together, and all the variables
-(-1w+125)+215=0
We get rid of parentheses
1w-125+215=0
We add all the numbers together, and all the variables
w+90=0
We move all terms containing w to the left, all other terms to the right
w=-90
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