X+y=279

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Solution for X+y=279 equation: 



X+X=279

We move all terms to the left:

X+X-(279)=0

We add all the numbers together, and all the variables

2X-279=0

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

2X=279

X=279/2

X=139+1/2

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