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y=ilosc jacka
y=3x
y-15=x+15
3x-15=x+15
3x-x=15+15
2x=30
x=30:2
x=15
y=3x=3×15=45
aga nazbierała 15, a jacek 45 kasztanów
y-15=x+15
3x-15=x+15
2x=30
x=15
y=45
odp. Jacek ma 45 kasztanow, a agnieszka 15