\(\frac{3}{7}.\frac{261}{3}-\frac{3}{7}.\frac{191}{3}-\frac{2}{5}\)
\(=\frac{3}{7}.\left(\frac{261}{3}-\frac{191}{3}\right)-\frac{2}{5}\)
\(=\frac{3}{7}.\frac{70}{3}-\frac{2}{5}\)
\(=10-\frac{2}{5}\)
\(=\frac{48}{5}\)
\(\frac{3}{7}.\frac{79}{3}-\frac{3}{7}.\frac{191}{3}-\frac{2}{5}\)
\(=\frac{3}{7}.\frac{-112}{3}-\frac{2}{5}\)
\(=-16-\frac{2}{5}\)
\(=-\frac{82}{5}\)