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y- wiek mamy
x- wiek córki
4(x+5)= y+5
3(x+10)=y+10
4x+20=y+5
3x+30=y+10
y= 4x+15
y= 3x+20
4x+15=3x+20
x=5
Odp. Córka ma 5 lat, a matka 35