4:4 4/5+ 2 2/7 * 5 1/7-7 11/12

1). 4 : 4 4/5 =4 :24/5 =4 *5/24 =5/6 
2).2 2/7 *5 1/4 =16/7 * 21/4 =4*3=12 
3). 5/6 +12 =12 5/6  
4) .12 5/6 - 7 11/12 =12 10/12 - 7 11/12 = 4 11/12