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