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8 { 3x/4 - x/8 ≤ 1/2 }
6x - x ≤ 4
5x ≤ 4
x ≤ 4/5
10x/16 ≤ 1/2
5x/8 ≤ 1/2
x ≤ 1/2 × 8/5
x ≤ 4/5
note : menurutku begitu