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y-cena rogala
2x+3y=4,9
x+0,3 = y
2x+3(x+0,3)=4,9
x+0,3 = y
2x+3x+0,9=4,9
x+0,3 = y
5x = 4
x+0,3 = y
x=0,8
y=1,1
Odp. Bułka kosztuje 0,80 zł, rogal 1,1zł.