How to align text at center view for PDF

Question

I have a PDF file which has each page being actually formed from 2 pages, like this (it is not in English):

I used mutool to split each page into 2 pages according to Peque's answer: Splitting a PDF page in two and it worked. But now the 2 pages does not align to the center but the odd pages are aligned to the left, while the even ones are aligned to the right:

How can I fix this? Please help me, thank you very much. Here is the link of the file: https://drive.google.com/open?id=1a_jQlx0rx0Zu1ms7IiFOydiu1bGfymSU

Answer 1

as per the manual page of man mutool

POSTER mutool poster [options] input.pdf [output.pdf]

   The poster command splits each page into tiles, and puts each tile on a
   page of its own. It's useful for printing a large page onto smaller
   pieces of paper that can then be glued together to create a large
   poster.

   -p password
          Use the specified password if the file is encrypted.

   -x factor
          Split the page into this many horizontal pieces.

   -y factor
          Split the page into this many vertical pieces.

   The output will have x times y number of pages for each input page.

it justs split the page width into the number of parts you mention.. it knows only the physical size of the paper/ page in x and y direction and splits.. it does nothing nor it does know anything about the text content it it.