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