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x - cena sera
30dag = 0,3kg
2/5kg = 0,4kg
0,4*x + 0,3 * 18,2 = 11,26
0,4x + 5,46 = 11,26
0,4x = 11.26 - 5,46
0,4x = 5,8 /: 0,4
x = 14,5
Odp Kilosera kosztowało 14,5 zł