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y-cena kg jabłek
5y+2x=17
175%y=x ;x=1,75y
5y+3,5y=17
y=2zł
x=3,5zł
1.75x- cena gruszek
2*1.75+5x=17
8,5x=17 /:8,5
x=2
kilogram jabłek kosztował 2 zł.