\(\dfrac{6^3.7-6^{13}.12}{6^3\left(5^3-5^2\right)}=\dfrac{6^3\left(7-12\right)}{5^3\left(125-25\right)}=\dfrac{-5}{100}=-\dfrac{1}{20}\)
\(=\dfrac{6^3\left(7-12\right)}{6^3\left(125-25\right)}=\dfrac{-5}{100}=-\dfrac{1}{20}\)
\(\dfrac{6^3.7-6^3.12}{6^3.\left(5^3-5^2\right)}=\dfrac{6^3.\left(-5\right)}{6^3.100}=\dfrac{1}{-20}\)