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The provided reaction is not balanced. To balance the equation, we need to make sure that the number of atoms of each element is the same on both sides of the equation. Here is the balanced equation:
4NO2(g) + O2(g) + 2H2O(l) → 4HNO3(aq) + 2NO2(aq)
In this balanced equation, we have 4 nitrogen atoms, 8 oxygen atoms, and 4 hydrogen atoms on both sides of the equation.