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x - wiek Kasi teraz
x-9=2(x-6-9)
x-9=2(x-15)
x-9=2x-30
x-2x=-30+9
-x=-21 /*(-1)
x=21
Odp. Kasia ma 21 lat
y - Kasia
x = y - 6
2(x - 9) = y - 9
2x - 18 = y - 9
2x - 18 = x + 6 - 9
2x = x + 15
x = 15