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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
28 = 11/x // - 11/x
28-(11/x) = 0
28-11*x^-1 = 0
-11*x^-1 = -28 // : -11
x^-1 = 28/11
-1 < 0
1/(x^1) = 28/11 // * x^1
1 = 28/11*x^1 // : 28/11
11/28 = x^1
x = 11/28
x = 11/28
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