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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
(4/11)/3 = 12/x // - 12/x
(4/11)/3-(12/x) = 0
(4/11)/3-12*x^-1 = 0
-12*x^-1 = -4/33 // : -12
x^-1 = 1/99
-1 < 0
1/(x^1) = 1/99 // * x^1
1 = 1/99*x^1 // : 1/99
99 = x^1
x = 99
x = 99
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