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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
12/x = 1/3 // - 1/3
12/x-(1/3) = 0
12/x-1/3 = 0
12*x^-1 = 1/3 // : 12
x^-1 = 1/36
-1 < 0
1/(x^1) = 1/36 // * x^1
1 = 1/36*x^1 // : 1/36
36 = x^1
x = 36
x = 36
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