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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
4/8 = 16/x // - 16/x
4/8-(16/x) = 0
4/8-16*x^-1 = 0
-16*x^-1 = -1/2 // : -16
x^-1 = 1/32
-1 < 0
1/(x^1) = 1/32 // * x^1
1 = 1/32*x^1 // : 1/32
32 = x^1
x = 32
x = 32
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