8/6+7/42=56/42+7/42=63/42=9/6=3/2
13/2+3/11=133/22+6/22=139/22
21/15+8/3=21/15+40/15=61/15
8/7+3/8=64/56+21/56=85/56
11/5+9/35=77/35+9/35=86/35
9/3-4/8=72/24-12/24=60/24=30/12=15/6
5/6+1/21=35/42+2/42=37/42
1/15+3/10=1/30+9/30=10/30=1/3
