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y- liczba 4
x - liczba piątek y - liczba czwórek x + y = 12 5x + 4y = 12 * 4,75 x = 9 y = 3
(5x + 48-4x) :12 =4.75
(x+48) :12 = 4.75
x=4.75 * 12 -48
x=57-48
x=9 piątek
12-9=3 czwórki