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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
10/8 = 11/x // - 11/x
10/8-(11/x) = 0
10/8-11*x^-1 = 0
-11*x^-1 = -5/4 // : -11
x^-1 = 5/44
-1 < 0
1/(x^1) = 5/44 // * x^1
1 = 5/44*x^1 // : 5/44
44/5 = x^1
x = 44/5
x = 44/5
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