(2*5/8-1*4/7)/[(3*1/12+4.375)/19*8/9]
=(2*35/56-1*32/56)/[(3*1/12+4*3/8)/179/9]
=1*3/56/[(3*2/24+4*9/24)*9/179]
=59/56/[7*11/24*9/179]
=59/56*8/3
=59/21
(2*5/8-1*4/7)/[(3*1/12+4.375)/19*8/9]
=(2*35/56-1*32/56)/[(3*1/12+4*3/8)/179/9]
=1*3/56/[(3*2/24+4*9/24)*9/179]
=59/56/[7*11/24*9/179]
=59/56*8/3
=59/21