Divide the difference of 2 1/4 and 3/4 by the sum of 3/4 and 5/6.

2 1/4 - 3/4 = 3/2
(2x4=8 +1 is 9. So, 9/4 - 3/4 is also 6/4)
Sum = add
3/4 + 5/6 = 19/12
Thus, its 3/2 ÷ 19/12
(remember keep change flip for this - KFC)
3/2 ÷ 19/12
3/2 x 12/19 = 36/38
Simplify to get 18/19
Answer : 18/19
Hope this helps!