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1/2x ≤ 4 - 5
1/2x ≤ -1
x ≤ -1 : 1/2
x ≤ -2
HP = { ... , -4 , -3 , -2 }
1/2 x ≤ -1
x ≤ -1/ 1/2
x ≤ -2