Монгол Бодлогын Сан

$\dfrac{\left[\left(5\dfrac{7}{12}-3\dfrac{11}{18}+1\dfrac{1}{24}\right)\cdot1\dfrac{5}{31}-\dfrac{3}{52}\cdot\left(2.5+1\dfrac{5}{6}\right)\right]\cdot1\dfrac{7}{13}}{\dfrac{19}{84}:\left(4\dfrac{13}{42}-3\dfrac{13}{28}+2\dfrac{5}{24}\right)+1\dfrac{2}{27}-\dfrac13\cdot\dfrac89:2}=?$