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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
1/x = 16 // - 16
1/x-16 = 0
1*x^-1 = 16 // : 1
x^-1 = 16
-1 < 0
1/(x^1) = 16 // * x^1
1 = 16*x^1 // : 16
1/16 = x^1
x = 1/16
x = 1/16
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