X+y=21,1

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Solution for X+y=21,1 equation: 



X+X=21.1

We move all terms to the left:

X+X-(21.1)=0

We add all the numbers together, and all the variables

2X-21.1=0

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

2X=21.1

X=21.1/2

X=10+1/1.81818181818

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