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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
93/x = 6 // - 6
93/x-6 = 0
93*x^-1 = 6 // : 93
x^-1 = 2/31
-1 < 0
1/(x^1) = 2/31 // * x^1
1 = 2/31*x^1 // : 2/31
31/2 = x^1
x = 31/2
x = 31/2
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