x=(90-2x)

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Solution for x=(90-2x) equation: 



x=(90-2x)

We move all terms to the left:

x-((90-2x))=0

We add all the numbers together, and all the variables

x-((-2x+90))=0



We calculate terms in parentheses: -((-2x+90)), so:

(-2x+90)

We get rid of parentheses

-2x+90

Back to the equation:

-(-2x+90)



We get rid of parentheses

x+2x-90=0

We add all the numbers together, and all the variables

3x-90=0

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

3x=90

x=90/3

x=30

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