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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
5/x = 25/4 // - 25/4
5/x-(25/4) = 0
5/x-25/4 = 0
5*x^-1 = 25/4 // : 5
x^-1 = 5/4
-1 < 0
1/(x^1) = 5/4 // * x^1
1 = 5/4*x^1 // : 5/4
4/5 = x^1
x = 4/5
x = 4/5
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