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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
y = x/x-6 // - x/x-6
y-(x/x)+6 = 0
y-1+6 = 0
y+5 = 0
x naleu017Cy do R
x in (-oo:0) U (0:+oo)
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