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3x - x ≤ 6 - 2
2x ≤ 4
x ≤ 4 : 2
x ≤ 2
⇔ 3x+2-2 ≤ x+6-2
⇔ 3x ≤ x+4
⇔ 3x-x ≤ x-x+4
⇔ 2x ≤ 4
⇔ 1/2 · 2x ≤ 1/2 . 4
⇔ x ≤ 2
HP = {x|x ≤ 2, x ∈ bil. bulat}