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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
5.8/x = 1.5 // - 1.5
5.8/x-1.5 = 0
5.8*x^-1 = 1.5 // : 5.8
x^-1 = 0.25862069
-1 < 0
1/(x^1) = 0.25862069 // * x^1
1 = 0.25862069*x^1 // : 0.25862069
3.86666666 = x^1
x = 3.86666666
x = 3.86666666
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