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You didn't follow the instructions. I can still answer your question: \[ x=4 \] is an interesting point as it divides our region of study in half horizontally: we are left to determine all that exists on one half (to avoid redundant information). Also, this point gives us some interesting relationships between its corresponding point $(x_{c1})$ and others. As $X \equiv x_5+X_4+ X_3 = 8+5+\bar{x}_3 \pmod p$. If we take an inverse $9^{-1} \equiv 9$, the formula simplifies further, $9X + X_c3 + 10x_3=24+x_c3$ ($0< x_c <23$).