X-0.1x=378.99

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Solution for X-0.1x=378.99 equation: 



X-0.1X=378.99

We move all terms to the left:

X-0.1X-(378.99)=0

We add all the numbers together, and all the variables

0.9X-378.99=0

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

0.9X=378.99

X=378.99/0.9

X=421+0.09/0.9

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