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y- wiek Agnieszki
x-1=2(y-1) |postawiamy wartość x z wzoru poniżej,
x=y+5
y+5-1=2y-2 |wiadome na prawo, niewiadome na lewo
y-2y=-2-5+1
-y=-6 |×(-1)
y=6
x=y+5=6+5=11
O: Basia ma 11 lat, a Agnieszka 6.