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2x - 6x 12- 8
-4x 4
x-1
2x - 6x ≤ 12 - 8
-4x ≤ 4
-x ≤ 4/4
-x ≤ 1
x ≥ -1
jadi himpunan penyelesaian..
HP = { -1, 0, 1, 2, 3,... }