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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
5/8 = 25/x // - 25/x
5/8-(25/x) = 0
5/8-25*x^-1 = 0
-25*x^-1 = -5/8 // : -25
x^-1 = 1/40
-1 < 0
1/(x^1) = 1/40 // * x^1
1 = 1/40*x^1 // : 1/40
40 = x^1
x = 40
x = 40
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