$\dfrac{20}{21}\times 2$ =

$3 \times\dfrac{15}{-9}$ =

$\dfrac{15}{10}\times\dfrac{9}{19}$ =

$\dfrac{3}{19}\times\dfrac{11}{2}$ =

$\dfrac{5}{2}\times\dfrac{15}{10}$ =

$\dfrac{2}{13}\times\dfrac{10}{3}$ =

$\dfrac{23}{3}\times\dfrac{3}{6}$ =

$\dfrac{5}{7}\times\dfrac{2}{9}$ =

$4 \times\dfrac{13}{26}$ =

$\dfrac{7}{-5}\times\dfrac{7}{-2}$ =