Write the number in the box \([\;]\) such that \(\dfrac{3}{7}\times[\;]=\dfrac{15}{98}\).
\(\dfrac{5}{14}\)
[\;] = \(\dfrac{15}{98}\div\dfrac{3}{7}=\dfrac{15}{98}\times\dfrac{7}{3}=\dfrac{105}{294}=\dfrac{5}{14}\).