\[\boxed{\mathbf{14.}}\]
\[60 - 7 = 53\]
\[60 - 47 = 13\]
\[60 - 57 = 3\]
\[70 - 9 = 61\]
\[70 - 49 = 21\]
\[70 - 59 = 11\]
\[80 - 4 = 76\]
\[80 - 24 = 56\]
\[80 - 64 = 16\]
\[90 - 2 = 88\]
\[90 - 52 = 38\]
\[90 - 72 = 18\]