45 and 28 have no common factor. In other words, you can't simplify that.
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28 over 90 in its simplest form is 14 over 45.
15/28 is the simplest form and, by definition, the simplest form must be equivalent to other forms of the ratio.
43/45 is in its simplest form.
17/45 is in its simplest form.
8/45 is in its simplest form