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-2 ≤ 2x ≤ 10
-2 ≤ 2x 2x ≤ 10
-1 ≤ x x ≤ 5
G = { -1, 0 , 1 , 2 , 3 ,4 5}
2.
3 ≤ x +1 ≤ 8
3 ≤ x + 1 x + 1 ≤ 8
3 - 1 ≤ x x ≤ 8 - 1
2 ≤ x x ≤ 7
H = {2 , 3 , 4 , 5 , 6 , 7}