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18.1=4w+2.1
We move all terms to the left:
18.1-(4w+2.1)=0
We get rid of parentheses
-4w-2.1+18.1=0
We add all the numbers together, and all the variables
-4w+16=0
We move all terms containing w to the left, all other terms to the right
-4w=-16
w=-16/-4
w=+4
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