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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
9/73 = 93/x // - 93/x
9/73-(93/x) = 0
9/73-93*x^-1 = 0
-93*x^-1 = -9/73 // : -93
x^-1 = 3/2263
-1 < 0
1/(x^1) = 3/2263 // * x^1
1 = 3/2263*x^1 // : 3/2263
2263/3 = x^1
x = 2263/3
x = 2263/3
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