X+y=1X-2y=-1

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Solution for X+y=1X-2y=-1 equation: 



X+X=1X-2X=-1

We move all terms to the left:

X+X-(1X-2X)=0

We add all the numbers together, and all the variables

X+X-(-1X)=0

We add all the numbers together, and all the variables

2X-(-1X)=0

We get rid of parentheses

2X+1X=0

We add all the numbers together, and all the variables

3X=0

X=0/3

X=0

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