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y - wiek Agnieszki
x-1 = 2y
x = y + 5
robiąc tym sposobem powinno wyjść dobrze ;)
y - wiek Agnieszki obecnie
rok temu :
x-1 = 2(y-1)
teraz :
x=y+5
x-1= 2(y-1)
x=y+5
y+5-1=2y - 2
x=y+5
6=y
x=6+5
y=6
x=11