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y-pierniki
x+y=113
2y = x + 1
te dwa równania trzeba rozwiązać
2y = x +1 czyli x=2y-1 to wstawiamy do pierwszego wwzoru
2y-1 +y = 113
3y = 114
y= 38
x +38 = 113
x=113 -38 = 75