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17.9=w-8.7
We move all terms to the left:
17.9-(w-8.7)=0
We get rid of parentheses
-w+8.7+17.9=0
We add all the numbers together, and all the variables
-1w+26.6=0
We move all terms containing w to the left, all other terms to the right
-w=-26.6
w=-26.6/-1
w=26+0.6/1
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