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x-wiek Basi
y-wiek agnieszki
2(x-1)=y-1
x+5=y
teraz przekształcamy drugie równanie
x+5=y | -5
x=y - 5
podstawiamy
2(y-5-1)=y-1 |+1
2y-11=y | - y , +11
y=11
x= 11-5= 6