(X+20)+y=180

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Solution for (X+20)+y=180 equation: 



(X+20)+X=180

We move all terms to the left:

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

We add all the numbers together, and all the variables

X+(X+20)-180=0

We get rid of parentheses

X+X+20-180=0

We add all the numbers together, and all the variables

2X-160=0

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

2X=160

X=160/2

X=80

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