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3x + 6 < 2x - 1
3x - 2x < - 1 -6
x < -7
atau
| 3x + 6 | < 2x - 1
-3x - 6 < 2x - 1
-5x < 5
x < -1
Jadi himpunan penyelesaiannya { -7,-1 }