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