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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
(9*(x-48))/x = 4 // - 4
(9*(x-48))/x-4 = 0
(9*(x-48))/x+(-4*x)/x = 0
9*(x-48)-4*x = 0
5*x-432 = 0
(5*x-432)/x = 0
(5*x-432)/x = 0 // * x
5*x-432 = 0
5*x-432 = 0 // + 432
5*x = 432 // : 5
x = 432/5
x = 432/5
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