Question 1205482
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There is no "x" in the problem....<br>
A simplified form of the given expression is A = (b!)/(b+1).<br>
Finding a more "simplified" expression looks difficult if not impossible; and the resulting expression will not be "simple".<br>
If you want more than this, re-post your question (correctly) and making it clear what "simplified" means to you.<br>