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6n + 9 = 129
6n = 120
n=20
liczby to:
2n + 1= 2*20+1=41
2n+3 = 43
2n + 5 = 45
Odp.: Szukane liczby to: 41, 43, 45.
6n =120
n = 20
2n + 1 = 41
2n +3 = 43
2n + 5 = 45
6n=129-1-3-5
6n=120
n=20
pierwsza liczba 2n+1= 41
druga 43
trzecia 45