X+y=0.8X-y=0.3

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Solution for X+y=0.8X-y=0.3 equation: 



X+X=0.8X-X=0.3

We move all terms to the left:

X+X-(0.8X-X)=0

We add all the numbers together, and all the variables

X+X-(-0.2X)=0

We add all the numbers together, and all the variables

2X-(-0.2X)=0

We get rid of parentheses

2X+0.2X=0

We add all the numbers together, and all the variables

2.2X=0

X=0/2.2

X=0

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