\(A=\left(\dfrac{3}{2}-\dfrac{2}{5} +\dfrac{1}{10}\right):\left(\dfrac{3}{2}-\dfrac{2}{3}+\dfrac{1}{12}\right)\\\)
\(=\left(\dfrac{15}{10}-\dfrac{4}{10}+\dfrac{1}{10}\right):\left(\dfrac{18}{12}-\dfrac{8}{12}+\dfrac{1}{12}\right)\)
\(=\left(\dfrac{15-4+1}{10}\right):\left(\dfrac{18-8+1}{12}\right)\)
\(=\dfrac{6}{5}:\dfrac{11}{12}\)
\(=\dfrac{72}{55}\)