X+y=1000-y

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Solution for X+y=1000-y equation: 



X+X=1000-X

We move all terms to the left:

X+X-(1000-X)=0

We add all the numbers together, and all the variables

X+X-(-1X+1000)=0

We add all the numbers together, and all the variables

2X-(-1X+1000)=0

We get rid of parentheses

2X+1X-1000=0

We add all the numbers together, and all the variables

3X-1000=0

We move all terms containing X to the left, all other terms to the right

3X=1000

X=1000/3

X=333+1/3

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