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D( x )
-x = 0
-x = 0
x = 0
x in (-oo:0) U (0:+oo)
5/(-x) = 25/8 // - 25/8
5/(-x)-(25/8) = 0
5/(-x)-25/8 = 0
-5*x^-1 = 25/8 // : -5
x^-1 = -5/8
-1 < 0
1/(x^1) = -5/8 // * x^1
1 = -5/8*x^1 // : -5/8
-8/5 = x^1
x = -8/5
x = -8/5
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