X+y=22.X-y=2

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Solution for X+y=22.X-y=2 equation: 



X+X=22.X-X=2

We move all terms to the left:

X+X-(22.X-X)=0

We add all the numbers together, and all the variables

X+X-(+21X)=0

We add all the numbers together, and all the variables

2X-(+21X)=0

We get rid of parentheses

2X-21X=0

We add all the numbers together, and all the variables

-19X=0

X=0/-19

X=0

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