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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
5/8 = 9/x+2 // - 9/x+2
5/8-(9/x)-2 = 0
5/8-9*x^-1-2 = 0
-9*x^-1 = 11/8 // : -9
x^-1 = -11/72
-1 < 0
1/(x^1) = -11/72 // * x^1
1 = -11/72*x^1 // : -11/72
-72/11 = x^1
x = -72/11
x = -72/11
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