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I don't know the problem off the top of my head and I don't have my book on me, but balancing Hydrogen in basic solution is done by adding H2O to one side and OH- on the other. In acidic solution, H+ is added to one side and H2O to the other. So if the reaction in this problem takes place in a basic solution, that explains the presence of OH-.
As they said before it is because the reaction is taking place in a basic solution. If that is confusing to add OH- what you can do is go through the problem normally, like add H+, balancing out the Hs and then at the end of the problem you just add one OH- on each side for every H+. Then you combine any H+ and OH- that are on the same side to form H20, and cancel out the extra H2Os.
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