(3|16+а)-3\8; а=5|12 (b+5\6)-3\4,b=11\12 (4\15+5\8)-c,c=3\5 (1\5+d)-9\20,d=13\16

(3/16 + а) - 3/8 = 3/16 + а - 6/16 = а - 3/16; а = 5/12
5/12 - 3/16 = 20/48 - 9/48 = 11/48

(b + 5/6) - 3/4 = b + 10/12 - 9/12 = b + 1/12; b = 11/12
11/12 + 1/12 = 12/12 = 1

(4/15 + 5/8) - с = 32/120 + 75/120 - с = 107/120 - с; с = 3/5
107/120 - 3/5 = 107/120 - 72/120 = 35/120 = 7/24

(1/5 + d) - 9/20 = 4/20 + d - 9/20 = d - 5/20 = d - 1/4; d = 13/16
13/16 - 1/4 = 13/16 - 4/16 = 9/16