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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
4*x-((2*x)/x)-5 = 0
4*x-5-2 = 0
4*x-7 = 0 // + 7
4*x = 7 // : 4
x = 7/4
x = 7/4
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