I wrote this equation:
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Code, edit and compile here:
\begin{equation}\begin{multlined}\frac{dW}{d\lambda} = \sigma_{1}-\sigma_{2}\nonumber= nk\Theta\times\Biggl(\frac{1}{2}\left(2\lambda-\frac{2}{\lambda^{3}}\right)\\+\frac{519\left(2\lambda-\frac{2}{\lambda^{3}}\right)\left(\lambda^{2}+\frac{1}{\lambda^{2}}+1\right)^{4}}{134750N^{4}}\\+\frac{19\left(2\lambda-\frac{2}{\lambda^{3}}\right)\left(\lambda^{2}+\frac{1}{\lambda^{2}}+1\right)^{3}}{1750N^{3}}\\+\frac{11\left(2\lambda-\frac{2}{\lambda^{3}}\right)\left(\lambda^{2}+\frac{1}{\lambda^{2}}+1\right)^{2}}{350N^{2}}\\+\frac{\left(2\lambda-\frac{2}{\lambda^{3}}\right)\left(\lambda^{2}+\frac{1}{\lambda^{2}}+1\right)}{10N}\Biggr)\end{multlined}
I don´t like it a lot and I would like to know what could I do to have a better equation displaying there.
Thanks for your help.