90-x=180-(180-x)

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



90-x=180-(180-x)

We move all terms to the left:

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

We add all the numbers together, and all the variables

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

We add all the numbers together, and all the variables

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



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

180-(-1x+180)

determiningTheFunctionDomain
-(-1x+180)+180

We get rid of parentheses

1x-180+180

We add all the numbers together, and all the variables

x

Back to the equation:

-(x)



We add all the numbers together, and all the variables

-2x+90=0

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

-2x=-90

x=-90/-2

x=+45

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