(8 5/7 -6 5/6 * 1 1/5) * 7 = ((8*7+5)/7 - (6*6+5)/6 * (1*5+1)/5) * 7 = (61/7 - 41/6 * 6/5) * 7 = (61/7 - 41/5) * 7 = ((61*5 - 41*7)/(7*5)) * 7 = (305 - 287)/35 * 7 = 18/5 = 3.6
(8 5/7 -6 5/6 * 1 1/5) * 7 = ((8*7+5)/7 - (6*6+5)/6 * (1*5+1)/5) * 7 = (61/7 - 41/6 * 6/5) * 7 = (61/7 - 41/5) * 7 = ((61*5 - 41*7)/(7*5)) * 7 = (305 - 287)/35 * 7 = 18/5 = 3.6