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x=y+25
y+25+y=45
x=y+25
2y=45-25
x=y+25
2y=20
x=y+25
y=10
x=10+25
y=10
x=35
Bartek ma 10 lat a jego tata 35 lat
2x = 45 - 25
2x = 20 / 2
x = 10 Bartek
Bartek 10 lat
Tata 35