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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
5/x = 25/20 // - 25/20
5/x-(25/20) = 0
5/x-5/4 = 0
5*x^-1 = 5/4 // : 5
x^-1 = 1/4
-1 < 0
1/(x^1) = 1/4 // * x^1
1 = 1/4*x^1 // : 1/4
4 = x^1
x = 4
x = 4
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