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D( x )
x/8 = 0
x/8 = 0
x/8 = 0
1/8*x = 0 // : 1/8
x = 0
x in (-oo:0) U (0:+oo)
6/8 = 12/(x/8) // - 12/(x/8)
6/8-(12/(x/8)) = 0
6/8-96*x^-1 = 0
-96*x^-1 = -3/4 // : -96
x^-1 = 1/128
-1 < 0
1/(x^1) = 1/128 // * x^1
1 = 1/128*x^1 // : 1/128
128 = x^1
x = 128
x = 128
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