// 7 x \
|| - -- - -- |
|| 16 16 |7 x | |
|| --------- for |-- + --| < 1|
|| 23 x |16 16| |
|| -- + -- |
|| 16 16 |
-256*|< |
|| oo |
|| ___ |
|| \ ` |
|| \ n -2*n n |
|| / (-1) *4 *(7 + x) otherwise |
|| /__, |
\\n = 1 /
-----------------------------------------------------
7 + x
$$- \frac{256 \left(\begin{cases} \frac{- \frac{x}{16} - \frac{7}{16}}{\frac{x}{16} + \frac{23}{16}} & \text{for}\: \left|{\frac{x}{16} + \frac{7}{16}}\right| < 1 \\\sum_{n=1}^{\infty} \left(-1\right)^{n} 4^{- 2 n} \left(x + 7\right)^{n} & \text{otherwise} \end{cases}\right)}{x + 7}$$
-256*Piecewise(((-7/16 - x/16)/(23/16 + x/16), |7/16 + x/16| < 1), (Sum((-1)^n*4^(-2*n)*(7 + x)^n, (n, 1, oo)), True))/(7 + x)