x-90=0.1*x

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Solution for x-90=0.1*x equation: 



x-90=0.1x

We move all terms to the left:

x-90-(0.1x)=0

We add all the numbers together, and all the variables

x-(+0.1x)-90=0

We get rid of parentheses

x-0.1x-90=0

We add all the numbers together, and all the variables

0.9x-90=0

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

0.9x=90

x=90/0.9

x=100

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