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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
2 = 24/x+4 // - 24/x+4
2-(24/x)-4 = 0
2-24*x^-1-4 = 0
-24*x^-1 = 2 // : -24
x^-1 = -1/12
-1 < 0
1/(x^1) = -1/12 // * x^1
1 = -1/12*x^1 // : -1/12
-12 = x^1
x = -12
x = -12
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