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D( X )
X-2 = 0
X = 0
X-2 = 0
X-2 = 0
X-2 = 0 // + 2
X = 2
X = 0
X = 0
X in (-oo:0) U (0:2) U (2:+oo)
60/X = 48/(X-2) // - 48/(X-2)
60/X-(48/(X-2)) = 0
60/X-48*(X-2)^-1 = 0
60/X-48/(X-2) = 0
(-48*X)/(X*(X-2))+(60*(X-2))/(X*(X-2)) = 0
60*(X-2)-48*X = 0
12*X-120 = 0
(12*X-120)/(X*(X-2)) = 0
(12*X-120)/(X*(X-2)) = 0 // * X*(X-2)
12*X-120 = 0
12*X-120 = 0 // + 120
12*X = 120 // : 12
X = 120/12
X = 10
X = 10
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