Which of the following is a decomposition reaction?

In the following equation:

${\mathrm{Na}}_2{\mathrm{CO}}_3 + \mathrm{xHCl}\to 2\mathrm{NaCl} + {\mathrm{CO}}_2 + {\mathrm{H}}_2\mathrm{O}$, the value of x is

${\mathrm{AgNO}}_{3\left(\mathrm{aq}\right)} + {\mathrm{NaCl}}_{\left(\mathrm{aq}\right)}\to {\mathrm{AgCl}}_{\left(\mathrm{s}\right)} + {\mathrm{NaNO}}_{3_{\left(\mathrm{aq}\right)}}$

Above reaction is