X,x-9=11

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Solution for X,x-9=11 equation: 



X.X-9=11

We move all terms to the left:

X.X-9-(11)=0

We add all the numbers together, and all the variables

X.X-20=0

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

X.X=20

X=20/1

X=20

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