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