Resposta :
Ruth,
(4/3 - 2/5):3/5 = x:(7/3 + 2)
(20/15 - 6/15) / 3/5 = x / (7/3 - 2)
(14/15)x(5/3) = x / (14 / 6 - 3/6)
(14x5) / (15x3) = x / (11/6)
70/45 = x / (11/6)
14/9 = x / 11/6
x = 14/9 x 11/6
= 154/54
x = 77/27 RESULTADO FINAL
Ok?
(4/3 - 2/5):3/5 = x:(7/3 + 2)
(20/15 - 6/15) / 3/5 = x / (7/3 - 2)
(14/15)x(5/3) = x / (14 / 6 - 3/6)
(14x5) / (15x3) = x / (11/6)
70/45 = x / (11/6)
14/9 = x / 11/6
x = 14/9 x 11/6
= 154/54
x = 77/27