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D( x )
-x = 0
-x = 0
x = 0
x in (-oo:0) U (0:+oo)
5/(-x) = 2.5/8 // - 2.5/8
5/(-x)-(2.5/8) = 0
5/(-x)-0.3125 = 0
-5*x^-1 = 0.3125 // : -5
x^-1 = -0.0625
-1 < 0
1/(x^1) = -0.0625 // * x^1
1 = -0.0625*x^1 // : -0.0625
-16 = x^1
x = -16
x = -16
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