\[\boxed{\text{5.\ 62}}\]
\[\textbf{а)}\ 2x - (2a - x) =\]
\[= 2x - 2a + x = 3x - 2a\]
\[\textbf{б)} - 3b + (a - 3b) =\]
\[= - 3b + a - 3b = a - 6b\]
\[\textbf{в)}\ 3 \cdot (2x - y) + y =\]
\[= 6x - 3y + y = 6x - 2y\]
\[\textbf{г)} - 4 \cdot ( - a + 3c) - 5a =\]
\[= 4a - 12c - 5a = - a - 12c\]
\[\textbf{д)}\ 5n \cdot ( - 2m - 4) + 20n =\]
\[= - 10mn - 20n + 20n =\]
\[= - 10mn\]
\[\textbf{е)}\ 15k - 3k \cdot (5 - 8m) =\]
\[= 15k - 15k + 24km = 24km\]