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14/7=2
5*2=10 tyle miała 5
2x+5x=14
7x=14
x=2
piątek:2*2=4
czwórek:5*2=10
2*2=4-oceny dobre
2*5=10-oceny b.dobre
odp.marysia ma 4 dobre i 10 b. dobre