I have a question about sets and subsets.

Consider the universe $\mathbb{Z}$ comprising of all integers and with the following sets:

$A=\{2m+1\}$

$B=\{2n-3\}$,

where $m$ and $n$ are elements of $\mathbb{Z}$.

In my book it says $A=B$, but whenever I plugin values it doesn't equal. How do I remake the formula inside set $B$ so it pops up a same number as $A$?