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Math signs

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philipamato View Drop Down
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Joined: 18 Nov 2012
Location: Germany
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    Posted: 18 Nov 2012 at 2:22pm
Receiving by e.mail, PDF files of math equations but when i open the files,  the +,-,= etc are replaced with black boxes. Why is this and how to fix? Is it because the PDF file was produced on windows, sent to me by e.mail and I am opening the files on my mac ?
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