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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
5/x = 0.86 // - 0.86
5/x-0.86 = 0
5*x^-1 = 0.86 // : 5
x^-1 = 0.172
-1 < 0
1/(x^1) = 0.172 // * x^1
1 = 0.172*x^1 // : 0.172
5.81395349 = x^1
x = 5.81395349
x = 5.81395349
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