(2 11/12*6+7/48*8-11 1/3)*(7/11-1/2)

(2 11/12*6+7/48*8-11 1/3)*(7/11-1/2)= (35/12*6+ 7/6 -34/3) * (14/22-11/22)= (35/2 +7/6-68/6) * 3/22= (35/2-61/6)*3/22= (105/6-61/6)*3/22=44/6*3/22= 2/2=1