/ / 2\ | 2|
| | (-5 + x) | |(-5 + x) |
|polylog|3, ---------| for ----------- <= 1
| \ 9 / 9
|
| oo
|____
<\ `
| \ -n 2*n
| \ 9 *(-5 + x)
| ) --------------- otherwise
| / 3
| / n
|/___,
\n = 1
--------------------------------------------
-5 + x
$$\frac{\begin{cases} \operatorname{Li}_{3}\left(\frac{\left(x - 5\right)^{2}}{9}\right) & \text{for}\: \frac{\left|{\left(x - 5\right)^{2}}\right|}{9} \leq 1 \\\sum_{n=1}^{\infty} \frac{9^{- n} \left(x - 5\right)^{2 n}}{n^{3}} & \text{otherwise} \end{cases}}{x - 5}$$
Piecewise((polylog(3, (-5 + x)^2/9), Abs((-5 + x)^2)/9 <= 1), (Sum(9^(-n)*(-5 + x)^(2*n)/n^3, (n, 1, oo)), True))/(-5 + x)