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y - lata panowania
1/4 * (x-5) = y-5
1/2 * (x+9) = y + 9
x-5 = 4y - 20
x+9 = 2y +18
x-4y = -15
x-2y = 9
-x+4y = 15
x-2y = 9
--------------+
2y = 24
y = 12
x-24=9
x=33
żył 33 panował 12