$\dfrac{4}{28}+\dfrac{11}{28}$ =

$\dfrac{5}{21}-\dfrac{21}{21}$ =

$\dfrac{28}{33}+\dfrac{4}{11}$ =

$1-\dfrac{61}{40}$ =

$\dfrac{4}{5}+\dfrac{13}{10}$ =

$\dfrac{-16}{28}+\dfrac{3}{4}$ =

$\dfrac{-21}{40}+\dfrac{6}{8}$ =

$3-\dfrac{47}{21}$ =

$\dfrac{2}{7}+\dfrac{11}{5}$ =

$\dfrac{11}{5}+\dfrac{3}{8}$ =