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128=172-w
We move all terms to the left:
128-(172-w)=0
We add all the numbers together, and all the variables
-(-1w+172)+128=0
We get rid of parentheses
1w-172+128=0
We add all the numbers together, and all the variables
w-44=0
We move all terms containing w to the left, all other terms to the right
w=44
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