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l - cena łańcuszka
l + w = 105
w - 8 + 120% l = 100
l + w = 105
w - 8 + 1,2 l = 100
l + w = 105
w + 1,2 l = 108
odejmujemy stronami
-0,2 l = -3
l = 15
w = 90