\(15\times\frac{1}{4}\times\frac{-5}{7}-25\times\frac{1}{4}\times\frac{-5}{7}\)
\(=\frac{1}{4}\times\frac{-5}{7}\left(15-25\right)\)
\(=\frac{1}{4}\times\frac{-5}{7}\times\left(-10\right)\)
\(=\frac{25}{14}\)
\(15\times\frac{1}{4}\times\frac{-5}{7}-25\times\frac{1}{4}\times\frac{-5}{7}=\frac{1}{4}\times\frac{-5}{7}\left(15-25\right)=\frac{1}{4}\times\frac{-5}{7}\times\left(-10\right)=\frac{25}{14}\)