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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
24/x = 8/5 // - 8/5
24/x-(8/5) = 0
24/x-8/5 = 0
24*x^-1 = 8/5 // : 24
x^-1 = 1/15
-1 < 0
1/(x^1) = 1/15 // * x^1
1 = 1/15*x^1 // : 1/15
15 = x^1
x = 15
x = 15
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