3 7/12+(-2 11/18)+2 1/24=43/12-47/18+49/24=(43*6-47*4+49*3)/72=(258-188+147)/72=217/72=3 1/72
5/14+5/6+(-1 6/7)=5/14+5/6-13/7=(5*3+5*7-13*6)/42=(15+35-78)/42=-38/42=-19/21
(2.75+(-6 5/12))+5 13/18=(2 3/4-77/12)+103/18=(11/4-77/12)+103/18=(33-77)12+103/18=44/12+103/18=(44*3+103*2)/36=(132+106)36=338/36=9 14/36=9 7/18