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x-0,6-cena batona
x- cena czekolady
2x-cena 2 czekolad
x-0,6+2x=6
3x-0,6=6 /+0,6
3x=6,6 /3
x=2,2 [zł]
x-0,6=2,2-0,6=1,6[zł]
odp: czekolada kosztowała 2,2zł, a baton 1,6zł.