$B=\frac{\left( \frac{1}{14}-\frac{\sqrt{5}}{7}+\frac{\sqrt{3}}{35} \right).\left( \frac{-4}{5} \right)}{\left( \frac{1}{10}+\frac{\sqrt{3}}{25}-\frac{\sqrt{5}}{5} \right).\frac{2}{7}}$
$B=\frac{\left( \frac{5}{70}-\frac{10\sqrt{5}}{70}+\frac{2\sqrt{3}}{70} \right).\left( \frac{-4}{5} \right)}{\left( \frac{5}{50}+\frac{2\sqrt{3}}{50}-\frac{10\sqrt{5}}{50} \right).\frac{2}{7}}$
$B=\frac{\frac{5-10\sqrt{5}+2\sqrt{3}}{70}.\frac{-4}{5}}{\frac{5+2\sqrt{3}-10\sqrt{5}}{50}.\frac{2}{7}}$
$B=\frac{-4\left( 5-10\sqrt{5}+2\sqrt{3} \right).50.7}{70.5.2.\left( 5-10\sqrt{5}+2\sqrt{3} \right)}$
$B=-2$