X+y=3.9

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Solution for X+y=3.9 equation: 



X+X=3.9

We move all terms to the left:

X+X-(3.9)=0

We add all the numbers together, and all the variables

2X-3.9=0

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

2X=3.9

X=3.9/2

X=1+1/1.0526315789474

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