Solve the inequality 18 – 3 (2x – 5) > 12; x ∈ W.
18 – 3 (2x – 5) > 12; x ∈ W
⇒ 18 – 6x + 15
⇒ 33 – 12 > 6x
⇒ 21 > 6x
⇒ 6x < 21 ⇒ x < (21/6) + 7/2 = 3.1/2
But x ∈ W, x = 0, 1, 2, 3
∴ Solution set = {0, 1, 2, 3}