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s - wiek syna (teraz)
m-2=4(s-2)
m+10+s+10=74
m-2=4s-8
m+s=54
m-4s=-6
m+s=54 /*4
m-4s=-6
4m+4s=216
5m=210
m=42
42+s=54
s=12
Odp: Matka ma 42 lata, a syn 12 lat.