(-1/27)×3/7+(5/9)×(-3/7)

($\frac{-1}{27}$ ). $\frac{3}{7}$ + $\frac{5}{9}$ . ($\frac{-3}{7}$ )

= ($\frac{-1}{63}$ ) + $\frac{-5}{21}$ 

= ($\frac{-1}{63}$ ) + $\frac{-15}{63}$ 

= $\frac{-16}{63}$