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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
(((12*x)/6)*x)/x-2 = 0
2*x-2 = 0 // + 2
2*x = 2 // : 2
x = 2/2
x = 1
x = 1
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