$\dfrac{-4}{28}+\dfrac{15}{28}$ =

$\dfrac{3}{25}+\dfrac{18}{25}$ =

$\dfrac{2}{4}+\dfrac{-15}{44}$ =

$\dfrac{1}{5}+\dfrac{4}{15}$ =

$\dfrac{-1}{20}+\dfrac{6}{10}$ =

$3-\dfrac{89}{28}$ =

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

$\dfrac{-9}{40}+\dfrac{6}{20}$ =

$\dfrac{-92}{25}+4$ =

$\dfrac{7}{11}+\dfrac{5}{4}$ =