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y=obecny wiek ani
x-1=3(y-1)
x+2=2(y+2)
x-1=3y-3
x+2=2y+4
x-3y=1-3
x-2y=4-2
x=3y-2
3y-2-2y=2
y=2+2
y=4
x=3×4-2=10
kasia ma 10, a ania 4 lata