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1/3x + 1 >_ 1/2x - 1/2
1/3x - 1/2x >_ -1/2 - 1
2/6x - 3/6 >_ -1/2 - 2/2
-1/6x >_ -3/2
-x >_ -3/2 (6)
-x >_ -9
x <_ 9
Maaf, kalau salah.
(-∞, 9]
HP = {..., 7, 8, 9}