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kedua ruas kalikan 6 (kpk dari 2 dan 3)
4(x - 1) ≤ 3x + 18
4x - 4 ≤ 3x + 18
4x - 3x ≤ 18 + 4
x ≤ 22
HP: {x | x ≤ 22, x ∈ A}