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x - 15 = y + 15
x = 3y
2y = 30 /:2
x = 3y
y=15
x=45
y=15
pzdr ;)
x- ilość kasztanów Agnieszki
3x-15= x=15
3x- x=15+15
2x= 30|:2
x= 15 - Agnieszka
3x - 45- Jacek