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128=213-w
We move all terms to the left:
128-(213-w)=0
We add all the numbers together, and all the variables
-(-1w+213)+128=0
We get rid of parentheses
1w-213+128=0
We add all the numbers together, and all the variables
w-85=0
We move all terms containing w to the left, all other terms to the right
w=85
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