It is already in its simplest form.
28/92 = 7/23
23/4
23/28
28/55 is in its simplest form.
28/9 is in its simplest form.
43/28 is in its simplest form.
28/185 is in its simplest form.
69/28 is in its simplest form.
9/28 is in its simplest form.
11/28 is the simplest form.
9/28 is in its simplest form.
33/28 is in its simplest form.