X+y=4.X-y=0

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Solution for X+y=4.X-y=0 equation: 



X+X=4.X-X=0

We move all terms to the left:

X+X-(4.X-X)=0

We add all the numbers together, and all the variables

X+X-(+3X)=0

We add all the numbers together, and all the variables

2X-(+3X)=0

We get rid of parentheses

2X-3X=0

We add all the numbers together, and all the variables

-X=0

X=0/-1

X=0

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