Question

If $\frac{4}{7}+\frac{2}{5}+\frac{-4}{5}+\frac{1}{7}+\frac{-5}{7}=\frac{-2}{m}$. Find $m$.

Answer 1

$\frac{4}{7}+\frac{2}{5}+\frac{-4}{5}+\frac{1}{7}+\frac{-5}{7}$

$=\frac{20+14-28+5-25}{35}$

$=\frac{-14}{35}$

$=\frac{-2}{5}$