Question

5/7-2/7
+2
+4/7
-2 2/5
-1/5
___
=??

Answer 1

$\tt\displaystyle \frac{5}{7} - \frac{2}{7} = \frac{3}{7} \\\\ \frac{3}{7} + 2 = 2 \frac{3}{7} \\\\ 2 \frac{3}{7} + \frac{4}{7} = 2 \frac{7}{7} = 3 \\\\ 3 - 2 \frac{2}{5} = 2 \frac{5}{5} - 2 \frac{2}{5} = \frac{3}{5} \\\\ \frac{3}{5} - \frac{1}{5} = \frac{2}{5}$