7/5 : 14/15 + 3/2 : ( 9/4 -1 + 1/2 ) * 2/7
= 7/5 * 15/14 + 3/2 : ( 9/4 - 1/1 + 1/2 ) * 2/7
= 3/2 + 3/2 : ( 9/4 - 4/4 + 1/2 ) * 2/7
= 3/2 + 3/2 : ( 5/4 + 1/2 ) * 2/7
= 3/2 + 3/2 : ( 5/4 + 2/4 ) * 2/7
= 3/2 + 3/2 : 7/4 * 2/7
= 3/2 + 3/2 * 4/7 * 2/7
= 3/2 + 6/7 * 2/7
= 3/2 + 12/49
= 147/98 + 24/98
= 171/98
