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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
3/x = 5.8/5.5 // - 5.8/5.5
3/x-(5.8/5.5) = 0
3/x-1.05454545 = 0
3*x^-1 = 1.05454545 // : 3
x^-1 = 0.35151515
-1 < 0
1/(x^1) = 0.35151515 // * x^1
1 = 0.35151515*x^1 // : 0.35151515
2.8448276 = x^1
x = 2.8448276
x = 2.8448276
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