If we subtract its successor from each number, we get:
This diagram clearly shows us the pattern of regularity. We see that:
\[
\begin{aligned}
z &= 52 – 5 = 47,
\\[1em]
y &= z – 6 = 47 – 6 = 41,
\\[1em]
x &= y – 7 = 41 – 7 = \boldsymbol{34}
\end{aligned}
\]
