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