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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
(9*x-48)/x = 5 // - 5
(9*x-48)/x-5 = 0
(9*x-48)/x+(-5*x)/x = 0
9*x-5*x-48 = 0
4*x-48 = 0
(4*x-48)/x = 0
(4*x-48)/x = 0 // * x
4*x-48 = 0
4*x-48 = 0 // + 48
4*x = 48 // : 4
x = 48/4
x = 12
x = 12
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