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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
(5*x)/x = 5 // - 5
(5*x)/x-5 = 0
0 = 0
x naleu017Cy do R
x in (-oo:0) U (0:+oo)
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