X-0.1x=420

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Solution for X-0.1x=420 equation: 



X-0.1X=420

We move all terms to the left:

X-0.1X-(420)=0

We add all the numbers together, and all the variables

0.9X-420=0

We move all terms containing X to the left, all other terms to the right

0.9X=420

X=420/0.9

X=466+0.59999999999997/0.9

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