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3x - 1 < 4
3x < 5
x < 5/3
syarat 3x - 1 > 0
3x > 1
x > 1/3
digabung maka hp 1/3 < x < 5/3
3x-1 < 4
3x < 4 + 1
3x < 5
x < 5/3