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-12 ≥ (x - |2x -1| ) ≥12
1) x - | 2x - 1| ≥ 12
x - 2x + 1 ≥ 12
-x ≥ 11
x ≤ 11 (tidak memenuhi)
2) x - (1 -2x) ≥ 12
x - 1 + 2x ≥ 12
3x ≥ 13
x ≥ 13/3 (tidak memenuhi)
3) x - | 2x -1| ≤ -12
x - 2x + 1 ≤ -12
-x ≤ -13
x ≥ 13 (memenuhi)
4) x - (1 - 2x) ≤ -12
x - 1 + 2x ≤ - 12
3x ≤ - 11
x ≤ - 11/3 (memenuhi)
HP x ≤ - 11/3 atau x ≥ 13
Jawab (B)