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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
16/x = 20/32 // - 20/32
16/x-(20/32) = 0
16/x-5/8 = 0
16*x^-1 = 5/8 // : 16
x^-1 = 5/128
-1 < 0
1/(x^1) = 5/128 // * x^1
1 = 5/128*x^1 // : 5/128
128/5 = x^1
x = 128/5
x = 128/5
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