(5/8y − 3/5y) ÷ (3/4z − 2/5z) factor out y and z and we have
[ y ( 5/8 - 3/5) ] / [z (3/4 - 2/5) ] getting common denominators, we have
[y (25/40 - 24/40)[ / [ z (15/20 - 8/20)] =
[ y/40 ] / [(7z ) / 20 ] =
(20/40) (y) / (7z) =
(1/2)y / (7z) =
y / [14 z]
