C.E.
(1/2)^(x + 2) - (1/4)^(3 - x) ≥ 0
(1/2)^(x + 2) ≥ (1/4)^(3 - x)
2^(-x - 2) ≥ 2^(2·(x - 3))
-x - 2 ≥ 2·(x - 3)---> -x - 2 ≥ 2·x - 6
3·x ≤ 4---> x ≤ 4/3
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