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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
Y = -25/x // + -25/x
Y-(-25/x) = 0
Y+25*x^-1 = 0
25*x^-1 = -Y // : 25
x^-1 = -Y/25
-1 < 0
1/(x^1) = -Y/25 // * x^1
1 = (-Y/25)*x^1 // : -Y/25
-25*Y^-1 = x^1
x = -25*Y^-1
x = -25*Y^-1
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