(X-0.10x)-90=0.40(90)

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Solution for (X-0.10x)-90=0.40(90) equation: 



(X-0.10X)-90=0.40(90)

We move all terms to the left:

(X-0.10X)-90-(0.40(90))=0

We add all the numbers together, and all the variables

(+0.9X)-90-(0.409)=0

We add all the numbers together, and all the variables

(+0.9X)-90.409=0

We get rid of parentheses

0.9X-90.409=0

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

0.9X=90.409

X=90.409/0.9

X=100+0.409/0.9

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