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x + 25%x - cena drugiej książki
x + 25%x = 1,25x
x + 1,25x = 72
2,25x = 72 /: 2,25
x = 32
Cena I książki to 32 złote
Cena II książki = 1,25*x = 1,25 * 32 = 40 złote