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x -7 > 3x - 9
-7 + 9 > 3x -x
2 > 2x ⇒ 1 > x
2. Langsung juga : 18x - 15 - 3x < 5x +15
15x - 5x < 15 + 15
10x < 30 ⇒ x < 3