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D( x )
x-24 = 0
x-24 = 0
x-24 = 0
x-24 = 0 // + 24
x = 24
x in (-oo:24) U (24:+oo)
4 = 24/(x-24) // - 24/(x-24)
4-(24/(x-24)) = 0
4-24*(x-24)^-1 = 0
4-24/(x-24) = 0
(4*(x-24))/(x-24)-24/(x-24) = 0
4*(x-24)-24 = 0
4*x-120 = 0
(4*x-120)/(x-24) = 0
(4*x-120)/(x-24) = 0 // * x-24
4*x-120 = 0
4*x-120 = 0 // + 120
4*x = 120 // : 4
x = 120/4
x = 30
x = 30
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