3/7+1/9=(3*9+1*7)/63=27/63+7/63=34/63
3/10+1/8=(3*8+1*10)/80=24/80+10/80=34/80=17/40
7/12+4/15=(7*15+4*12)/180=105/180+48/180=153/180=17/20
3/4+5/6=(3*6+5/4)/24=18/24+20/24=38/24=19/12=1 7/12
2/5+3/7=(2*7+3*5)/35=14/35+15/35=29/35
9/14+2/21=(9*21+2*14)/294=189/294+28/294=217/294=31/42
2/3+2/15=(2*15+2*3)/45=30/45+6/45=36/45=4/5
3/20+6/25=(3*25+6*20)/500=75/500+120/500=195/500=39/100
1/3+5/8=(1*8+5*3)/24=8/24+15/24=23/24
1/6+2/9=(1*9+2*6)/54=9/54+12/54=21/54=7/18
7/9+2/15=(7*15+2*9)/135=105/135+18/135=123/135=41/45
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3/7+1/9=(3*9+1*7)/63=27/63+7/63=34/63
3/10+1/8=(3*8+1*10)/80=24/80+10/80=34/80=17/40
7/12+4/15=(7*15+4*12)/180=105/180+48/180=153/180=17/20
3/4+5/6=(3*6+5/4)/24=18/24+20/24=38/24=19/12=1 7/12
2/5+3/7=(2*7+3*5)/35=14/35+15/35=29/35
9/14+2/21=(9*21+2*14)/294=189/294+28/294=217/294=31/42
2/3+2/15=(2*15+2*3)/45=30/45+6/45=36/45=4/5
3/20+6/25=(3*25+6*20)/500=75/500+120/500=195/500=39/100
1/3+5/8=(1*8+5*3)/24=8/24+15/24=23/24
1/6+2/9=(1*9+2*6)/54=9/54+12/54=21/54=7/18
7/9+2/15=(7*15+2*9)/135=105/135+18/135=123/135=41/45