\[\boxed{\mathbf{37}.}\]
\[1)\ 3(a + 7) = 3a + 21\]
\[2)\ 9(4 - b) = 36 - 9b\]
\[3)\ 15(m + n) = 15m + 15n\]
\[4)\ (p - 8) \cdot 12 = 12p - 96\]
\[5)\ 8(5a + 3b) = 40a + 24b\]
\[6)\ (13m - 14n + 17p) \cdot 5 =\]
\[= 65m - 70n + 85p\]