Explicație pas cu pas:
2x<11 => x<11/2 => x<5,5 => x€{0,1,2,3,4,5} => A={0,1,2,3,4,5}
|2x|<17 => -17<2x<17 => -8,5<x<8,5 =>
x€{-8,-7,-6,-5,-4,-3,-2,-1,0,1,2,3,4,5,6,7,8} =>
B={0,+-1,+-2,+-3,+-4,+-5,+-6,+-7,+-8}
x|24 => x€D24 in N => x€{1,2,3,4,6,8,12,24} =>
C={1,2,3,4,6,8,12,24}