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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
24/x = 3/0.5 // - 3/0.5
24/x-(3/0.5) = 0
24/x-6 = 0
24*x^-1 = 6 // : 24
x^-1 = 1/4
-1 < 0
1/(x^1) = 1/4 // * x^1
1 = 1/4*x^1 // : 1/4
4 = x^1
x = 4
x = 4
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