\(=\frac{2^{30}.3^{18}.2.3.7-3.2^{30}.3^{20}}{2^8.5^2.2^{20}.3^{20}-2^{10}.2^{19}.3^{19}.5.7}\)
\(=\frac{2^{31}.3^{19}.7-2^{30}.3^{21}}{2^{28}.5^2.3^{20}-2^{29}.3^{19}.5.7}\)
\(=\frac{2^{30}.3^{19}\left(2.7-3^2\right)}{2^{28}.3^{19}\left(5^2.3-2.5.7\right)}\)
\(=\frac{2^2.5}{5}=\frac{20}{5}=4\)