x+(90-x)+(180-2x)=180

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Solution for x+(90-x)+(180-2x)=180 equation: 



x+(90-x)+(180-2x)=180

We move all terms to the left:

x+(90-x)+(180-2x)-(180)=0

We add all the numbers together, and all the variables

x+(-1x+90)+(-2x+180)-180=0

We get rid of parentheses

x-1x-2x+90+180-180=0

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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