(4-y)*(4+y)+ y do kwadratu-16=
= 4(do kwadratu) - y( do kwadratu) + y(do kwadratu) - 16 = 16-y(do kwadratu) + y(do kwadratu) - 16 = 0
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= 4(do kwadratu) - y( do kwadratu) + y(do kwadratu) - 16 = 16-y(do kwadratu) + y(do kwadratu) - 16 = 0