\(\dfrac{15}{2}-\dfrac{3}{5}:\dfrac{1}{2}\)
\(=\dfrac{15}{2}-\dfrac{6}{5}\)
\(=\dfrac{75}{10}-\dfrac{12}{10}\)
\(=\dfrac{63}{10}\)
\(---\)
\(\dfrac{5}{9}:\dfrac{7}{6}:\dfrac{10}{3}\)
\(=\dfrac{5}{9}\times\dfrac{6}{7}\times\dfrac{3}{10}\)
\(\dfrac{1}{7}\)