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y - wiek Michała
[x = y + 9
[x - 5 = 2 (y - 5)
y + 9 - 5 = 2y - 10
y - 2y = -10 - 9 + 5
- y = - 14 /: (-1)
y = 14
x = 14 + 9
x = 23
[x = 23
[y = 14