( x - 12 23/40) + 5 8/15 = 13 19/24
x - 12 23/40 + 5 8/15 = 13 19/24
x - 12 69/120 + 5 64/120 = 13 19/24
x - 7 5/120 = 13 19/24
x - 7 1/24 = 13 19/24
x = 13 19/24 + 7 1/24
x = 20 20/24
x = 20 5/6
( x - 12 23/40) + 5 8/15 = 13 19/24
x - 12 23/40 + 5 8/15 = 13 19/24
x - 12 69/120 + 5 64/120 = 13 19/24
x - 7 5/120 = 13 19/24
x - 7 1/24 = 13 19/24
x = 13 19/24 + 7 1/24
x = 20 20/24
x = 20 5/6