Answer:
12/49 or 0.24489795918
Step-by-step explanation (by hand):
Use PEMDAS!
5 1/4 -> 5 2/8 -> 42/8
42/8 - 7/8 = 35/8
2 4/7 -> 18/7
18/7 * 5/12 (multiply across) = 90 / 84
90/84 ÷ 35/8 -> (flip & multiply) 90/84 * 8/35
90/84 * 8/35 = 720/2940 -> 12/49 = 0.24489795918