$\dfrac{-12}{24}-\dfrac{13}{24}$ =

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

$\dfrac{1}{33}+\dfrac{1}{11}$ =

$3+\dfrac{3}{10}$ =

$\dfrac{-53}{40}+\dfrac{4}{8}$ =

$\dfrac{-6}{15}+\dfrac{4}{3}$ =

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

$6+\dfrac{3}{2}$ =

$\dfrac{23}{6}+\dfrac{1}{3}$ =

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