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x-liczba dziewczyn
x+y=150
1\3x + 2/7y= 46 |*21
x=150-y
7x+6y=966
x=150-y
7(150-y)+6y=966
x=150-y
1050-7y+6y=966
x=150-y
1y=966-1050|:(-1)
x=150-84
y=84
x=66
y=84
Odp. Dziewczyn piszacych bylo 66, a chlopcow 84.
Na pewno bdb bo robilismy to na lekcji ;))