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y - 2 ksiazka
z - 3 ksiazka
x = 1,2z
y = 1,3z
x+y+z=105
1,2z+1,3z+z=105
3,5z = 105
z=30
x = 1,2*30 = 36
y = 1,3*30 = 39
z=30
_______________
36+39+30 = 105zł