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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
422/x = 9 // - 9
422/x-9 = 0
422*x^-1 = 9 // : 422
x^-1 = 9/422
-1 < 0
1/(x^1) = 9/422 // * x^1
1 = 9/422*x^1 // : 9/422
422/9 = x^1
x = 422/9
x = 422/9
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