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|x| < a
- a < x < a
maka:
|1 - 2x| < 5
- 5 < 1 - 2x < 5
- 6 < - 2x < 4
- 4 < 2x < 6
- 2 < x < 3
1-2x>-5
-2x>-6
x<3
dan
1-2x<5
-2x<4
x>-2 trus dibuat garis trus digabungkan