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D( x )
5.5-x = 0
5.5-x = 0
5.5-x = 0
5.5-x = 0 // - 5.5
-x = -5.5 // * -1
x = 5.5
x in (-oo:5.5) U (5.5:+oo)
(2*x^2)/(5.5-x) = 0
2*x^2 = 0 // : 2
x^2 = 0
x = 0
x = 0
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