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105 > 15 × (3x - 2)
105 > 45x - 30
105 + 30 > 45x
135 > 45x
135/45 > x
3 > ×
jadi x < 3 (a)
L : (3 x -2)
peny : 15 x (3 x -2) =
15 x -6 = -90cm