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X+0.1X=423.99
We move all terms to the left:
X+0.1X-(423.99)=0
We add all the numbers together, and all the variables
1.1X-423.99=0
We move all terms containing X to the left, all other terms to the right
1.1X=423.99
X=423.99/1.1
X=385+0.48999999999995/1.1
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