X+y=7X-9y=-13

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Solution for X+y=7X-9y=-13 equation: 



X+X=7X-9X=-13

We move all terms to the left:

X+X-(7X-9X)=0

We add all the numbers together, and all the variables

X+X-(-2X)=0

We add all the numbers together, and all the variables

2X-(-2X)=0

We get rid of parentheses

2X+2X=0

We add all the numbers together, and all the variables

4X=0

X=0/4

X=0

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