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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
11/x = 9/12 // - 9/12
11/x-(9/12) = 0
11/x-3/4 = 0
11*x^-1 = 3/4 // : 11
x^-1 = 3/44
-1 < 0
1/(x^1) = 3/44 // * x^1
1 = 3/44*x^1 // : 3/44
44/3 = x^1
x = 44/3
x = 44/3
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