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12-x= ilość 4
¹/₁₂(5x+4(12-x))=4,75/×12
5x+48-4x=57
x=57-48
x=9
12-x=12-9=3
miała 9 piatek i 3 czwórki.
miała 9 piatek i 3 czwórki.