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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
63/x = 23 // - 23
63/x-23 = 0
63*x^-1 = 23 // : 63
x^-1 = 23/63
-1 < 0
1/(x^1) = 23/63 // * x^1
1 = 23/63*x^1 // : 23/63
63/23 = x^1
x = 63/23
x = 63/23
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