This is the accepted version of the following article: [Eisenberg, T. (2015), Problems Section. School Science and Mathematics, 115: 314. doi: 10.1111/ssm.12140], which has been published in final form at http://onlinelibrary.wiley.com/doi/10.1111/ssm.12140/abstract
Diaz-Barrero, J.L. [Solution to the problem] 5365[: a system of nonlinear equations]. "School science and mathematics [en línia]", Octubre 2015, vol. 115, núm. 6, p. 314.