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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
(12*x-7)/x = 17/x // - 17/x
(12*x-7)/x-(17/x) = 0
(12*x-7)/x-17*x^-1 = 0
(12*x-7)/x-17/x = 0
12*x-17-7 = 0
12*x-24 = 0
(12*x-24)/x = 0
(12*x-24)/x = 0 // * x
12*x-24 = 0
12*x-24 = 0 // + 24
12*x = 24 // : 12
x = 24/12
x = 2
x = 2
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