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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
1.25 = 5/x // - 5/x
1.25-(5/x) = 0
1.25-5*x^-1 = 0
-5*x^-1 = -1.25 // : -5
x^-1 = 0.25
-1 < 0
1/(x^1) = 0.25 // * x^1
1 = 0.25*x^1 // : 0.25
4 = x^1
x = 4
x = 4
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