[tex]–(2n + 4) + 6 = –9 + 4(2n + 1) \\ \\ -2n - 4 + 6 = -9 + 4(2n + 1) \\ \\ -2n + 2 = -9 + 4(2n + 1) \\ \\ -2n + 2 = 4(2n + 1) - 9 \\ \\ -2n + 2 = 8n + 4 - 9 \\ \\ -2n + 2 = 8n - 5 \\ \\ 2 = 8n - 5 + 2n \\ \\ 2 = 10n - 5 \\ \\ 2 + 5 = 10n \\ \\ 7 = 10n \\ \\ \frac{7}{10} = n \\ \\ n = \frac{7}{10} \\ \\ [/tex]
The final result is: n = 7/10 or n = 0.7.