(X+20)+(x-40)+(X+20)=180

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Solution for (X+20)+(x-40)+(X+20)=180 equation: 



(X+20)+(X-40)+(X+20)=180

We move all terms to the left:

(X+20)+(X-40)+(X+20)-(180)=0

We get rid of parentheses

X+X+X+20-40+20-180=0

We add all the numbers together, and all the variables

3X-180=0

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

3X=180

X=180/3

X=60

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