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x-33-wiek syna;
x/3-wiek córki;
x-15+x-33-15+x/3-15=48;
2x-78+x/3=48/×3;
6x-234+x=144;
7x=144+234;
7x=378/:7;
x=54-tj. wiek ojca;
x-33=54-33=21-tj. wiek syna;
x/3=54/3=18-tj. wiek córki;