x=(180-x)+(90-x)

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Solution for x=(180-x)+(90-x) equation: 



x=(180-x)+(90-x)

We move all terms to the left:

x-((180-x)+(90-x))=0

We add all the numbers together, and all the variables

x-((-1x+180)+(-1x+90))=0



We calculate terms in parentheses: -((-1x+180)+(-1x+90)), so:

(-1x+180)+(-1x+90)

We get rid of parentheses

-1x-1x+180+90

We add all the numbers together, and all the variables

-2x+270

Back to the equation:

-(-2x+270)



We get rid of parentheses

x+2x-270=0

We add all the numbers together, and all the variables

3x-270=0

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

3x=270

x=270/3

x=90

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