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