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y=wiek Zosi
x=3y
y=x-30
x=3y
y=3y-30
x=3y
y-3y=-30
x=3y
-2y=-30
y=-30:-2
y=15 x=3y=3 razy 15=45
odp. zosia ma 15 lat.
y- wiek taty
y=3x
y=30+x
3x=30+x
2x=30
x=15
y=45
Zosia ma 15 lat