\[\frac{12n + 4}{4n - 3} = \frac{3 \cdot (4n - 3) + 13}{4n - 3} =\]
\[= \frac{3(4n - 3)}{4n - 3} + \frac{13}{4n - 3} =\]
\[= 3 + \frac{13}{4n - 3}\]
\[делители\ числа\ 13:\ \ 1;\ - 1;13;\ \]
\[- 13.\]