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3x=42
x=14
te liczby to 14,16,18
2n + 2 - 2. liczba
2n+4 - 3.liczba
2n + 2n + 2 + 2n+4 = 48
6n + 6 = 48 | -6
6n = 42 | :6
n = 7
1. liczba = 2 × 7 = 14
2.liczba = 2 × 7 + 2 = 16
3. liczba = 2 × 7 + 4 = 18
Odp.: Te liczby to 14, 16 i 18.