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12 - 6x < 3x - 6
- 6x - 3x < - 6 - 12
- 9x < - 18
x > 2
b) 3x - 1/4 < x/2 - 1 (kalikan 4)
12x - 1 < 2x - 4
12x - 2x < - 4 + 1
10x < - 3
x < - 3/10