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4x - 9 ≤ 11 , x ∈ { bilangan prima }
Pembahasan
4x - 9 ≤ 11 , x ∈ { bilangan prima }
4x - 9 + 9 ≤ 11 + 9
4x ≤ 20
x ≤ 5
∴ Himpunan Penyelesaian = { 2 , 3 ,5 }