$\dfrac{16}{44}+\dfrac{5}{44}$ =

$\dfrac{18}{21}+\dfrac{-7}{21}$ =

$\dfrac{6}{3}-\dfrac{17}{21}$ =

$\dfrac{-25}{6}+3$ =

$\dfrac{31}{33}+\dfrac{3}{11}$ =

$\dfrac{-62}{33}+\dfrac{5}{3}$ =

$\dfrac{3}{4}+\dfrac{5}{11}$ =

$\dfrac{1}{6}+\dfrac{33}{12}$ =

$\dfrac{2}{11}+\dfrac{7}{3}$ =

$6-\dfrac{20}{7}$ =