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tata Bartka - y
x+y= 45
y = x+25
x + x + 25 = 45
y = x+25
2x=45-25
y=x+25
x=10
y=35
Bartek ma 10 lat, a jego tata 35.
tata-y
x+y=45
y=x+45
2x=45-25
y=x+25
x=10
y=35
Bartek ma 10 lat a tata ma 35 lat