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X-0.1X=18.9
We move all terms to the left:
X-0.1X-(18.9)=0
We add all the numbers together, and all the variables
0.9X-18.9=0
We move all terms containing X to the left, all other terms to the right
0.9X=18.9
X=18.9/0.9
X=20+0.9/0.9
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