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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
5.8/x = 3/2.8 // - 3/2.8
5.8/x-(3/2.8) = 0
5.8/x-1.07142857 = 0
5.8*x^-1 = 1.07142857 // : 5.8
x^-1 = 0.18472906
-1 < 0
1/(x^1) = 0.18472906 // * x^1
1 = 0.18472906*x^1 // : 0.18472906
5.41333345 = x^1
x = 5.41333345
x = 5.41333345
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