Evaluate: 7 1/4 - [5/6 ÷ {1/3 - (1/2 × (3/4 - 1/4))}]

3/4 - 1/4 = 1/2; 1/2 × 1/2 = 1/4; 1/3 - 1/4 = 1/12; 5/6 ÷ 1/12 = 10; 29/4 - 10 = -11/4 = -2 3/4. (Verified against the official SSC answer key.)