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You add water when you are in need of more oxygen. The way I balance redox reactions is add H2O when I need additional oxygen, and H+ when I need to add hydrogen, when balancing in acidic solution. When balancing in basic solution, I start off as if I'm balancing in acidic solution, and once I finish as though it's acidic, I add some OH-'s to both sides of the reaction. The number of OH-'s corresponds with the number of H+'s. So the OH-'s and H+'s cancel each other out to make water, then you add the half reactions, and finally you remove like terms from the left and right side of the final reaction. After you're done, make sure you check once again that there are the same number of atoms on both sides and that the charges agree.
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