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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
(4*x)/x-((3*x)/x)-1-1+1 = 0
(4*x)/x-3-1-1+1 = 0
0 = 0
x naleu017Cy do R
x in (-oo:0) U (0:+oo)
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