How do i edit out the dark places in a pdf?

how do i edit out the dark places in a pdf? I xeroxed pages from a book, and the xeroxes were not of great quality--lots of shadows where the book opened on the copier glass.
When I had the xeroxes scanned, the dark places turned deep black and made the xeroxed/ scanned texts almost unreadable.
How can I lighten the images in the PDFs so that the text is readable again?

Depending on your Acrobat version; see if anything in these Blogs help
http://blogs.adobe.com/acrolaw/2007/12/cleaning_up_scanned_images/
http://blogs.adobe.com/acrolaw/2014/01/how-to-erase-and-clean-up-a-scanned-pdf-in-acrobat- xi/

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How do i edit out the dark places in a pdf?

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