Question 1209660
.
Find the conic section represented by the equation


x^2 - 4x + y^2 = y^2 + 8x + 20
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Reduce to the standard form 


    x^2 - 12x - 20 = 0.


This equation does not represents any conic section 

(neither circle, nor ellipse, nor parabola, and nor hyperbola).



<U>ANSWER</U>.  This equation does not represent any conic section.


The answer in the post by @CPhill is INCORRECT.