(.1x)-x=90

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Solution for (.1x)-x=90 equation: 



(.1x)-x=90

We move all terms to the left:

(.1x)-x-(90)=0

We add all the numbers together, and all the variables

(+.1x)-x-90=0

We add all the numbers together, and all the variables

-1x+(+.1x)-90=0

We get rid of parentheses

-1x+.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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