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You only add OH- when dealing with basic solutions. So, when balancing a basic solution, you start by adding H2O to balance the oxygens. Then you add H+ to balance the hydrogens. (This is where you would stop if it were an acidic solution.) Then you add OH- to balance the H+ (because you can't have H+ in a basic solution). So the H+ and the OH- combine to form H20 and then you cancel out any excess H20.
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