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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
1.33 = 0.25/x // - 0.25/x
1.33-(0.25/x) = 0
1.33-0.25*x^-1 = 0
-0.25*x^-1 = -1.33 // : -0.25
x^-1 = 5.32
-1 < 0
1/(x^1) = 5.32 // * x^1
1 = 5.32*x^1 // : 5.32
0.18796992 = x^1
x = 0.18796992
x = 0.18796992
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