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y- Michał
x+y= 38
x= 3y
3y+y= 38
4y= 38
y= 9.5
x= 3*9.5= 28.5
2007 rok- Tomek- 28,5 , Michał- 9,5
2012 - o 5 lat wiecej, Tomek- 33.5, Michał 14,5