(X-90)+(x-90)+80=180

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Solution for (X-90)+(x-90)+80=180 equation: 



(X-90)+(X-90)+80=180

We move all terms to the left:

(X-90)+(X-90)+80-(180)=0

We add all the numbers together, and all the variables

(X-90)+(X-90)-100=0

We get rid of parentheses

X+X-90-90-100=0

We add all the numbers together, and all the variables

2X-280=0

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

2X=280

X=280/2

X=140

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