Electrochemistry · Metal insoluble salt electrode potential

MX is a sparingly soluble salt that follows the given solubility equilibrium at 298 K

$\ce{MX(s) <=> M+(aq) + X^-(aq)}$; $K_\mathrm{sp} = 10^{-10}$

If the standard reduction potential for

$\ce{M+(aq) ->[+e^-] M(s)}$ is $\left(E^\ominus_{\mathrm{M^+/M}}\right) = 0.79$ V, then the value of the standard reduction potential for the metal/metal insoluble salt electrode $E^\ominus_{\mathrm{X^-/MX(s)/M}}$ is mV. (nearest integer)

[Given: $\dfrac{2.303RT}{F} = 0.059$ V]