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x+2 - druga liczba
x+4 - trzecia liczba
x + x+2 + x+4 = 129
3x + 6 = 129 |-6
3x = 123 | :3
x = 41
x+2 = 43
x+4= 45
(43-2) + 43 + (43+2)=41+43+45=129
Są to liczby:
41
43
45