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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
5/x = 4/10 // - 4/10
5/x-(4/10) = 0
5/x-2/5 = 0
5*x^-1 = 2/5 // : 5
x^-1 = 2/25
-1 < 0
1/(x^1) = 2/25 // * x^1
1 = 2/25*x^1 // : 2/25
25/2 = x^1
x = 25/2
x = 25/2
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