Respuesta :
la fraccion que hay que adicionar = x
3/7+x = 2
(3+7x)/7 = 2
3+7x = 14
7x = 14-3
7x = 11
x= 11/7
probamos
11/7+3/7 = 2
14/7 02
2=2
3/7+x = 2
(3+7x)/7 = 2
3+7x = 14
7x = 14-3
7x = 11
x= 11/7
probamos
11/7+3/7 = 2
14/7 02
2=2