X-0.90x=66

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Solution for X-0.90x=66 equation: 



X-0.90X=66

We move all terms to the left:

X-0.90X-(66)=0

We add all the numbers together, and all the variables

0.1X-66=0

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

0.1X=66

X=66/0.1

X=660

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