X+y=y+20

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Solution for X+y=y+20 equation: 



X+X=X+20

We move all terms to the left:

X+X-(X+20)=0

We add all the numbers together, and all the variables

2X-(X+20)=0

We get rid of parentheses

2X-X-20=0

We add all the numbers together, and all the variables

X-20=0

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

X=20

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