( 9/56 - (7/15 - 5/12) * ( 3/14 + 1/2)=9/56-(28/60-25/60)*(3/14+7/14)=9/56-(3/60*10/14)=9/56-(1/20*5/7)=9/56-5/140=45/280-10/280=35/280=1/8
1) 7/15 - 5/12 = 84-75/180 = 9/180 = 1/20
2) 3/14 + 1/2 = 3+7/14 = 10/14 =5/7
3) 9/56 - 1/20 * 5/7 = 9/56 - 5/140 = 9/56 - 1/28 = 9-2/56 = 7/56 = 1/8
