How to merge two pages of a PDF into one

how merge 2 pages (within same pdf file) 1 page?  example, have scanned 3x5 card; front of card on page 1 , of card on page two.  how merge them front , of card on same page?  thanks!

no possible in acrobat. can use front of 2 cards y using simplex printing acrobat.

 

in th original application can open blank letter sized page (8.5 11)  or whatver desired size.

open original , copy of everything. paste special. paste in new document create new pdf.

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