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x - normalny
x + ⅔x = 210
1⅔ x = 210
(5/3)x = 210
x = 210 * ⅗
x = 126
126*⅔ = 84
normalny - 126zł
ulgowy - 84zł
⅔ x- bilet ulgowy
210- cena obu biletów
x + ⅔ x = 210
1⅔ x = 210 /:1⅔
x= 210 : ⁵/₃
x= 210 × ⅗
x= 42×3
x= 126(zł)- cena biletu normalnego
⅔ x= ⅔ × 126= 84(zł) - cena biletu ulgowego