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No. 4 All About Balance

I scanned in a document on mathematics using optical character recognition software, unfortunately it failed to get one equation exactly right. The equation should balance but it is slightly off. I know that all the digits and symbols are correct and only one of them is out of place. This brainteaser is to correct this simple equation by moving just one digit or sign, you may not however change any of them.

Suggested by Nicholas Vining

102 = 101 - 1

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