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y - wiek córki
4 (y + 5) = x + 5
3 (y + 10) = x + 10
4y + 20 = x + 5
3y + 30 = x + 10
x = 4y + 15
x = 3y + 20
4y + 15 = 3y + 20
y = 5
x = 35
y = 5
odp: Obecnie mama ma 35 lat, a córka 5.