There must be the same number of atoms of each element on both sides.
To balance an equation, just do one type of atom at a time:
Unbalanced H2SO4 + NaOH - Na2SO4 + H2O
Balance Hydrogen on Right Hand Side H2SO4 + NaOH - Na2SO4 + 2H2O
Balance Sodium Hydroxide on Left Hand Side H2SO4 + 2NaOH - Na2SO4 +2H2O
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