\(a.\frac{x-1}{x+2}=\frac{4}{5}\left(x\ne-2\right)\) e)\(\frac{x}{-8}=\frac{2}{-x^3}\left(x\ne0\right)\)
b)\(\frac{1}{12}:\frac{4}{21}=3\frac{1}{2}:\left(3x-2\right)\) F)\(\frac{x}{8}=\frac{x}{x^3}\left(x\ne0\right)\)
c)\(\frac{x^2}{-8}=\frac{27}{x}\left(x\ne0\right)\)
d)\(\frac{x+7}{-20}=\frac{-5}{x+7}\left(x\ne-7\right)\)