\(\frac{2}{5}\) .x=\(\frac{4}{7}\) : \(\frac{2}{3}\) .
\(\frac{2}{5}\) .x = \(\frac{4}{7}\) x \(\frac{3}{2}\)
\(\frac{2}{5}\) .x=\(\frac{6}{7}\)
x = \(\frac{6}{7}\) : \(\frac{2}{5}\)
x= \(\frac{6}{7}\) . \(\frac{5}{2}\)
x= \(\frac{15}{7}\)
\(\frac{2}{5}\times x=\frac{4}{7}\div\frac{2}{3}\)
\(\frac{2}{5}\times x=\frac{4}{7}\times\frac{3}{2}\)
\(\frac{2}{5}\times x=\frac{6}{7}\)
\(x=\frac{6}{7}\div\frac{2}{5}\)
\(x=\frac{6}{7}\times\frac{5}{2}\)
\(x=\frac{15}{7}\)
\(\frac{2}{5}\cdot x=\frac{4}{7}:\frac{2}{3}\)
\(\frac{2}{5}\cdot x=\frac{6}{7}\)
\(x=\frac{6}{7}:\frac{2}{5}\)
\(x=2\frac{1}{7}\)
Vậy \(x=2\frac{1}{7}\)