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D( y )
y = 0
y = 0
y = 0
y in (-oo:0) U (0:+oo)
5/y-(5/y)-6+6 = 0
5/y-5*y^-1-6+6 = 0
0 = 0
y należy do R
y in (-oo:0) U (0:+oo)
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