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X+0.18X=40
We move all terms to the left:
X+0.18X-(40)=0
We add all the numbers together, and all the variables
1.18X-40=0
We move all terms containing X to the left, all other terms to the right
1.18X=40
X=40/1.18
X=33+1/1.1132075471698
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