X+y=12.X-y=2

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Solution for X+y=12.X-y=2 equation: 



X+X=12.X-X=2

We move all terms to the left:

X+X-(12.X-X)=0

We add all the numbers together, and all the variables

X+X-(+11X)=0

We add all the numbers together, and all the variables

2X-(+11X)=0

We get rid of parentheses

2X-11X=0

We add all the numbers together, and all the variables

-9X=0

X=0/-9

X=0

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