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

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



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

We move all terms to the left:

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

We get rid of parentheses

X+X-20-40-180=0

We add all the numbers together, and all the variables

2X-240=0

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

2X=240

X=240/2

X=120

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