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