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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
31.25 = 5/x // - 5/x
31.25-(5/x) = 0
31.25-5*x^-1 = 0
-5*x^-1 = -31.25 // : -5
x^-1 = 6.25
-1 < 0
1/(x^1) = 6.25 // * x^1
1 = 6.25*x^1 // : 6.25
0.16 = x^1
x = 0.16
x = 0.16
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