( 7 1/2 * 2 2/3 - 12 1/4 : 7/9 ) :6 + 3 1/8 + 5 2/7=9 5/42
1) 7 1/2 * 2 2/3 = 15/2 * 8/3 =(5*4)/(1*1)=20
2) 12 1/4 : 7/9 = 49/4 * 9/7 = (7*9)/(4*1)= 63/4=15 3/4
3) 20 - 15 3/4 = 4 1/4
4) 4 1/4 : 6 = 17/4 * 1/6 = 17/24
5) 17/24 + 3 1/8 = 17/24 + 25/8 = (17+75)/24 = 92/24=23/6=3 5/6
6) 3 5/6 + 5 2/7 = 23/6 + 37/7 =(161+222)/42=383/42= 9 5/42