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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
((2-1)/x)/3 = -4 // + 4
((2-1)/x)/3+4 = 0
1/3*x^-1 = -4 // : 1/3
x^-1 = -12
-1 < 0
1/(x^1) = -12 // * x^1
1 = -12*x^1 // : -12
-1/12 = x^1
x = -1/12
x = -1/12
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