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y- liczba chłopców
[x+y=150
[1/3x+2/7y=46 /21
[x+y=150
[7x+6y=966
[x=150-y
[7(150-y)+6y=966
[x=150-y
[1050-7y+6y=966
[x=150-y
[-y=-86
[x= 64
[y=86