x=9(90-x)

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Solution for x=9(90-x) equation: 



x=9(90-x)

We move all terms to the left:

x-(9(90-x))=0

We add all the numbers together, and all the variables

x-(9(-1x+90))=0



We calculate terms in parentheses: -(9(-1x+90)), so:

9(-1x+90)

We multiply parentheses

-9x+810

Back to the equation:

-(-9x+810)



We get rid of parentheses

x+9x-810=0

We add all the numbers together, and all the variables

10x-810=0

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

10x=810

x=810/10

x=81

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