\[\boxed{\mathbf{14}\mathbf{.}}\]
\[\textbf{а)}\ 36 + 6 = 42\]
\[36 + 26 = 62\]
\[36 - 26 = 10\]
\[\textbf{б)}\ 48 + (16 - 9) = 48 + 7 = 55\]
\[15 - 7 + 65 = 8 + 65 = 73\]
\[77 - (4 + 19) = 77 - 23 = 54\]
\[26 + 74 - 33 = 100 - 33 = 67\]
\[100 - (3 + 28) = 100 - 31 = 69\]
\[90 - (64 - 62) = 90 - 2 = 88\]