X+y=100.X-y=10

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Solution for X+y=100.X-y=10 equation: 



X+X=100.X-X=10

We move all terms to the left:

X+X-(100.X-X)=0

We add all the numbers together, and all the variables

X+X-(+99X)=0

We add all the numbers together, and all the variables

2X-(+99X)=0

We get rid of parentheses

2X-99X=0

We add all the numbers together, and all the variables

-97X=0

X=0/-97

X=0

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