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1 ≤ 4x + 5 ≤ 8
1 ≤ 4x + 5
1 - 5 ≤ 4x
-4 ≤ 4x
-1 ≤ x
4x + 5 ≤ 8
4x ≤ 8 - 5
4x ≤ 3
x ≤ 3/4
-1 ≤ x ≤ 3/4