I have the following equation where $c$ may be some constant (derived from the Riemann sum of $\int_{1}^{x}\frac{1}{s^{2}}ds$):
$\displaystyle \sum_{i=1}^{n}\frac{1}{\left(n+i\left(x-1\right)\right)^{2}}=c$
Is it possible to isolate $\sum_{i=1}^{n}\frac{1}{i^{2}}$ on the LHS? I would be grateful for any help on this.