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D( x )
8*x = 0
4*x = 0
8*x = 0
8*x = 0
8*x = 0 // : 8
x = 0
4*x = 0
4*x = 0
4*x = 0 // : 4
x = 0
x in (-oo:0) U (0:+oo)
(2*x)/(8*x) = x/(4*x) // - x/(4*x)
(2*x)/(8*x)-(x/(4*x)) = 0
(2*x)/(8*x)-1/4 = 0
0 = 0
x naleu017Cy do R
x in (-oo:0) U (0:+oo)
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