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5/4x - 3 < 1
5/4x < 1 + 3
5/4x < 4
x < 4 . 5/4
x < 20/4
x < 5
| 5/4x-3 |² ≤ 1²
5/4x-3 ≤ 1
5/4x ≤ 1 + 3
5/4x ≤ 4
x ≤ 4 / ⁵/₄
x ≤ 4 x ⁴/₅
x ≤ 3 ¹/₅