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|x - 1| = 1 - x
|x + 2| = x + 2
|9 - 3x| = 9 - 3x
Jadi
| x - 1 | + | x + 2 | - | 9 - 3x |
= 1 - x + x + 2 - (9 - 3x)
= 1 - x + x + 2 - 9 + 3x
= 3x - 6