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19.8-7w=2.3
We move all terms to the left:
19.8-7w-(2.3)=0
We add all the numbers together, and all the variables
-7w+17.5=0
We move all terms containing w to the left, all other terms to the right
-7w=-17.5
w=-17.5/-7
w=2+2.3333333333333/4.6666666666667
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