a)\(\frac{9}{6}+\frac{7}{24}=\frac{36}{24}+\frac{7}{24}=\frac{36+7}{24}=\frac{43}{24}\)
b)\(\frac{-5}{7}+\frac{8}{14}=\frac{-10}{14}+\frac{8}{14}=\frac{-10+18}{14}=\frac{8}{14}\)\(=\)\(\frac{4}{7}\)
c)\(\frac{-7}{6}+\left(-2\right)=\frac{-7}{6}+\frac{-2}{1}=\frac{-7}{6}+\frac{-12}{6}=\frac{-7+\left(-12\right)}{6}=\frac{-19}{6}\)
d)\(\frac{-50}{300}+\frac{-40}{200}=\frac{-10000}{60000}+\frac{-12000}{60000}=\frac{-10000+\left(-12000\right)}{60000}=\frac{-22000}{60000}\)