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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
(1/(-1))/12-((1/4)/x)-4 = 0
(-1/4)*x^-1-1/12-4 = 0
-1/4*x^-1 = 49/12 // : -1/4
x^-1 = -49/3
-1 < 0
1/(x^1) = -49/3 // * x^1
1 = -49/3*x^1 // : -49/3
-3/49 = x^1
x = -3/49
x = -3/49
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