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y=ilosc chłopców
x+y=150
⅓x+²/₇y=46/×21
x=150-y
7(150-y)+6y=966
1050-7y+6y=966
-y=966-1050
-y=-84
y=84
x=150-84=66
test pisało 66 dziewcząt i 84 chłopców