\[\boxed{\text{5.\ 83}}\]
\[\textbf{а)}\ (a + c - n) \cdot 5 =\]
\[= 5a + 5c - 5n\]
\[\textbf{б)}\ 7 \cdot (x - y - z) =\]
\[= 7x - 7y - 7z\]
\[\textbf{в)} - 1,2 \cdot (s - b - c) =\]
\[= - 1,2s + 1,2b + 1,2c\]
\[\textbf{г)}\ (3x - 5 + 4k) \cdot ( - 3) =\]
\[= - 9x + 15 - 12k\]
\[\textbf{д)}\ (4a - 6c + z) \cdot ( - 1) =\]
\[= - 4a + 6c - z\]
\[\textbf{е)}\ (m + k - 9 - n) \cdot a =\]
\[= am + ak - 9a - an\]