Paper is a fairly translucent substrate. The thinner/lighter weight or higher quality the paper the more translucent it is. The result is "show-through" - seeing a ghost image of what was printed on the reverse side - whether reading the page itself or scanning/photocopying it.
To eliminate show-through in scans and/or photocopies, simply place a piece of black paper behind the sheet that you are scanning. This evens out the tonality of the page and effectively eliminates show-through.
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