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y-cena opakowania
x+y=1,2zł
x-y=1zł
x=1,2zł-y
x-y=1zł
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1,2zł-y-y=1zł
-2y=-0,2zł
y=0,1zł
x=1,2zł-y
x=1,2zł-0,1zł
x=1,1zł
y=0,1zł