X+y=399

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Solution for X+y=399 equation: 



X+X=399

We move all terms to the left:

X+X-(399)=0

We add all the numbers together, and all the variables

2X-399=0

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

2X=399

X=399/2

X=199+1/2

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