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18w+8.1=-220.5
We move all terms to the left:
18w+8.1-(-220.5)=0
We add all the numbers together, and all the variables
18w+228.6=0
We move all terms containing w to the left, all other terms to the right
18w=-228.6
w=-228.6/18
w=-12+1.9090909090909/2.7272727272727
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