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D( y )
y = 0
y = 0
y = 0
y in (-oo:0) U (0:+oo)
(127943.46/y)*y = 127943.46 // - 127943.46
(127943.46/y)*y-127943.46 = 0
0 = 0
y należy do R
y in (-oo:0) U (0:+oo)
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