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D( x )
2*x = 0
2*x = 0
2*x = 0
2*x = 0 // : 2
x = 0
x in (-oo:0) U (0:+oo)
(6*x-4)/(2*x) = 0
6*x-4 = 0 // + 4
6*x = 4 // : 6
x = 4/6
x = 2/3
x = 2/3
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