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Wojtek: x
Kasia: 2x
6 lat temu:
Wojtek: x-6 <=> y
Kasia: 2x-6 <=> 5y
2x-6= 5y
x-6= y
2x-6= 5(x-6)
2x-6= 5x-30
-3x= -24
x= 8
Odp: Wojtek ma obecnie 8 lat, a Kasia 16.