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y - wiek córki
x = 3y
y+16=x-16
y +16= x-16
y-x=-16-16
y-x=-32
y - 3y = -32
-2y = -32/:(-2)
y = 16
x = 3y
x=3*16
x=48
ODP. X=48, y=16 czyli obecnie matka ma 48 a corka 16 lat.