$\dfrac{16}{40}+\dfrac{5}{40}$ =

$\dfrac{4}{12}+\dfrac{3}{12}$ =

$\dfrac{8}{20}+\dfrac{5}{4}$ =

$\dfrac{-5}{28}+\dfrac{4}{14}$ =

$\dfrac{-67}{12}+6$ =

$\dfrac{14}{21}+\dfrac{2}{7}$ =

$\dfrac{7}{3}+\dfrac{5}{8}$ =

$\dfrac{5}{2}+\dfrac{7}{3}$ =

$\dfrac{1}{3}+\dfrac{9}{21}$ =

$5+\dfrac{-31}{7}$ =