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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
44/3 = 12/x // - 12/x
44/3-(12/x) = 0
44/3-12*x^-1 = 0
-12*x^-1 = -44/3 // : -12
x^-1 = 11/9
-1 < 0
1/(x^1) = 11/9 // * x^1
1 = 11/9*x^1 // : 11/9
9/11 = x^1
x = 9/11
x = 9/11
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