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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
Y/x = -12/5 // + -12/5
Y/x-(-12/5) = 0
Y/x+12/5 = 0
Y*x^-1 = -12/5 // : Y
x^-1 = -12/5/Y
-1 < 0
1/(x^1) = -12/5/Y // * x^1
1 = (-12/5/Y)*x^1 // : -12/5/Y
-5/12*Y = x^1
x = -5/12*Y
x = -5/12*Y
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