(X)+(x+18)+90=180

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Solution for (X)+(x+18)+90=180 equation: 



(X)+(X+18)+90=180

We move all terms to the left:

(X)+(X+18)+90-(180)=0

We add all the numbers together, and all the variables

X+(X+18)-90=0

We get rid of parentheses

X+X+18-90=0

We add all the numbers together, and all the variables

2X-72=0

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

2X=72

X=72/2

X=36

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