The positive integer n , for which the solutions of the equation\\ $\mathrm{x}(\mathrm{x}+2)+(\mathrm{x}+2)(\mathrm{x}+4)+\ldots .+(\mathrm{x}+2 \mathrm{n}-2)(\mathrm{x}+2 \mathrm{n})$\\ $=\frac{8 n}{3}$\\ are two consecutive even integers, is :