Step 1:
The equilibrium reaction for the formation of $\mathrm{Fe}^{3+}$ is represented as follows:
\[ \mathrm{Fe}^{3+} + 6\mathrm{CN}^- \rightleftharpoons \mathrm{K}_{3}\left[\mathrm{Fe}(\mathrm{CN})_{6}\right] \]
Let $x$ represent the equilibrium concentration of
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