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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
4/16 = 5.5/x // - 5.5/x
4/16-(5.5/x) = 0
4/16-5.5*x^-1 = 0
-5.5*x^-1 = -1/4 // : -5.5
x^-1 = 0.04545455
-1 < 0
1/(x^1) = 0.04545455 // * x^1
1 = 0.04545455*x^1 // : 0.04545455
21.9999978 = x^1
x = 21.9999978
x = 21.9999978
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