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3x -> wiek ojca
3x - 5 -> wiek matki
x + 3x + 3x - 5 = 93
7x - 5 = 93
7x = 98
x = 14
x = 14 --> wiek syna
3x = 3 * 14 = 42 --> wiek ojca
3x - 5 = 3 * 14 - 5 = 42 - 5 = 37 -->wiek matki
14x3=42 42-5=37 a wiec 14+42+37=93