{2/x - 1 ≥ 0
{(x - 1)^2/(2·x·(2·x - 1)) ≤ 0
----------------------
{(2 - x)/x ≥ 0
{(x - 1)^2/(2·x·(1 - 2·x)) ≥ 0
--------------------------
{0 < x ≤ 2
{x = 1 ∨ 0 < x < 1/2
Soluzione sistema: [0 < x < 1/2 ∨ x = 1]
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