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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
5/x = 11/3 // - 11/3
5/x-(11/3) = 0
5/x-11/3 = 0
5*x^-1 = 11/3 // : 5
x^-1 = 11/15
-1 < 0
1/(x^1) = 11/15 // * x^1
1 = 11/15*x^1 // : 11/15
15/11 = x^1
x = 15/11
x = 15/11
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