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