\(\dfrac{6^{14}+2^{14}.9^8}{12.8^4.3^{12}}=\dfrac{\left(2.3\right)^{14}+2^{14}.\left(3^2\right)^8}{12.\left(2^3\right)^4.3^{12}}\)\(=\dfrac{2^{14}.3^{14}+2^{14}.3^{16}}{2^2.3.2^{12}.3^{12}}\)
\(=\dfrac{2^{14}.3^{14}\left(1+3^2\right)}{2^{14}.3^{13}}\)
\(=3.\left(1+3^2\right)\)
\(=3.\left(1+9\right)\)
\(=3.10\)
\(=30\)