Question

(а+ 3 4/7)-1 2/7=4 3/7

Answer 1

$a+ frac{25}{7} = frac{31}{7} + frac{9}{7} \ a+ frac{25}{7} = frac{40}{7} a= frac{40}{7} - frac{25}{7} a= frac{15}{7}$