1/5+8/25+7/25=5/25+8/25+7/25=20/25=4/5
1/7+2/21+3/7=3/21+2/21+9/21=14/21=2/3
1/15+2/45+7/15=3/45+2/45+21/45=26/45
3/49+5/7+4/49=3/49+35/49+4/49=42/49=6/7
7/10+2/15+11/30=21/30+4/30+11/30=36/30=6/5=1 1/5
1/12+1/18+1/12=2/12+1/18=1/6+1/18=3/18+1/18=4/18=2/9