(x-12 23/40)+5 8/15=13 19/24

(x - 12 23/40) + 5 8/15 = 13 19/24x = 12 23/40 + 13 19/24 - 5 8/15x = 20 + (23/40 + 19/24 - 8/15)x = 20 + (69 + 95 - 64)/120x = 20 5/6