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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
-9/x = -24/x-5 // + -24/x-5
5-9/x-(-24/x) = 0
24*x^-1-9/x+5 = 0
15*x^-1 = -5 // : 15
x^-1 = -1/3
-1 < 0
1/(x^1) = -1/3 // * x^1
1 = -1/3*x^1 // : -1/3
-3 = x^1
x = -3
x = -3
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