X+y=5.X-y=3

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Solution for X+y=5.X-y=3 equation: 



X+X=5.X-X=3

We move all terms to the left:

X+X-(5.X-X)=0

We add all the numbers together, and all the variables

X+X-(+4X)=0

We add all the numbers together, and all the variables

2X-(+4X)=0

We get rid of parentheses

2X-4X=0

We add all the numbers together, and all the variables

-2X=0

X=0/-2

X=0

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