\[ (n + 6)^2 = n^2 + 12n + 36 \]
\[ (2 - n)(2 + n) = 2^2 - n^2 = 4 - n^2 \]
\[ (n^2 + 12n + 36) + (4 - n^2) = n^2 + 12n + 36 + 4 - n^2 = 12n + 40 \]
\[ 12 \cdot (-\frac{5}{12}) + 40 = -5 + 40 = 35 \]
Ответ: 35