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19.65+0.4w=-1.6w-18.15
We move all terms to the left:
19.65+0.4w-(-1.6w-18.15)=0
We get rid of parentheses
0.4w+1.6w+18.15+19.65=0
We add all the numbers together, and all the variables
2w+37.8=0
We move all terms containing w to the left, all other terms to the right
2w=-37.8
w=-37.8/2
w=-18+1/1.1111111111111
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