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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
9/11 = 4/x // - 4/x
9/11-(4/x) = 0
9/11-4*x^-1 = 0
-4*x^-1 = -9/11 // : -4
x^-1 = 9/44
-1 < 0
1/(x^1) = 9/44 // * x^1
1 = 9/44*x^1 // : 9/44
44/9 = x^1
x = 44/9
x = 44/9
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