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