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II liczba - x+1
III liczba - x+1+1 = x+2
x+x+1+x+2 = 2x+13
3x+3 = 2x+13
3x-2x = 13-3
x = 10
I liczba - 10
II liczba - 10+1 = 11
III liczba - 11+1 = 12