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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
3.4/x = 2.5/4.4 // - 2.5/4.4
3.4/x-(2.5/4.4) = 0
3.4/x-0.56818182 = 0
3.4*x^-1 = 0.56818182 // : 3.4
x^-1 = 0.1671123
-1 < 0
1/(x^1) = 0.1671123 // * x^1
1 = 0.1671123*x^1 // : 0.1671123
5.98399998 = x^1
x = 5.98399998
x = 5.98399998
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