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x+4 - mianownik
x/(x+4) -----szukany ułamek
(x+5)/(x+9) = 2/3 ----mnożę na krzyż
3x + 15 = 2x + 18
x = 3 ------licznik
x+4 =3+4 = 7 -------mianownik
3/7 ========szukany ułamek