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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
99/12 = 25.5/x // - 25.5/x
99/12-(25.5/x) = 0
99/12-25.5*x^-1 = 0
-25.5*x^-1 = -33/4 // : -25.5
x^-1 = 0.32352941
-1 < 0
1/(x^1) = 0.32352941 // * x^1
1 = 0.32352941*x^1 // : 0.32352941
3.09090911 = x^1
x = 3.09090911
x = 3.09090911
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