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y - wiek taty
x+y=45
y-x=25 /+x
x+y=45
y=25+x
x+25+2=45
2x+25=45 /-25
2x=20 /÷2
x=10
10+y=45 /-10
y=35
odp: Bartek ma 10 lat, a jego tata 35.