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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
24/x = 4/12 // - 4/12
24/x-(4/12) = 0
24/x-1/3 = 0
24*x^-1 = 1/3 // : 24
x^-1 = 1/72
-1 < 0
1/(x^1) = 1/72 // * x^1
1 = 1/72*x^1 // : 1/72
72 = x^1
x = 72
x = 72
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