x-0.1x=81

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Solution for x-0.1x=81 equation: 



x-0.1x=81

We move all terms to the left:

x-0.1x-(81)=0

We add all the numbers together, and all the variables

0.9x-81=0

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

0.9x=81

x=81/0.9

x=90

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