N 14
{4·(x - 1)/3 - 2·x·(x - 1) + 2·(x^2 + 3) ≥ 0
{2/3·x - (1 - x)·(1 + x) - x^2 - 1 ≤ 0
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{4·(x - 1) - 6·x·(x - 1) + 6·(x^2 + 3) ≥ 0
{2·x - 3·(1 - x)·(1 + x) - 3·x^2 - 3 ≤ 0
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{(4·x - 4) - (6·x^2 - 6·x) + (6·x^2 + 18) ≥ 0
{2·x - (3 - 3·x^2) - 3·x^2 - 3 ≤ 0
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{10·x + 14 ≥ 0
{2·x - 6 ≤ 0
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{x ≥ - 7/5
{x ≤ 3
Soluzione sistema: [ - 7/5 ≤ x ≤ 3 ]