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y=ilośc 4
x+y=12
(5x+4y):12=4,75
x=12-y
[5(12-y)+4y]:12=4,75
(60-5y+4y):12=4,75/×12
-y=57-60
-y=-3
y=3
x=12-3=9
odp. ma 9 piątek