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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
4/3 = 8/x-1 // - 8/x-1
4/3-(8/x)+1 = 0
4/3-8*x^-1+1 = 0
-8*x^-1 = -7/3 // : -8
x^-1 = 7/24
-1 < 0
1/(x^1) = 7/24 // * x^1
1 = 7/24*x^1 // : 7/24
24/7 = x^1
x = 24/7
x = 24/7
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