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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
86/100 = 5/x // - 5/x
86/100-(5/x) = 0
86/100-5*x^-1 = 0
-5*x^-1 = -43/50 // : -5
x^-1 = 43/250
-1 < 0
1/(x^1) = 43/250 // * x^1
1 = 43/250*x^1 // : 43/250
250/43 = x^1
x = 250/43
x = 250/43
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