90=x-(.1x)

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



90=x-(.1x)

We move all terms to the left:

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

We add all the numbers together, and all the variables

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



We calculate terms in parentheses: -(x-(+.1x)), so:

x-(+.1x)

We get rid of parentheses

x-.1x

We add all the numbers together, and all the variables

0.9x

Back to the equation:

-(0.9x)



We add all the numbers together, and all the variables

-(+0.9x)+90=0

We get rid of parentheses

-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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