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=> 6y ≥ 81
=> 2y ≥ 27
=> y ≥ (27/2)
= 6y - 1 - 80 ≥ 0
= 6y - 81 ≥ 0
= 6y ≥ 81 (dibagi 3)
= 2y ≥ 27
= y ≥ (27/2)
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