[latex][( frac{7}{15} + frac{1}{3} - frac{1}{5} ) * frac{5}{4} +( frac{1}{2} - frac{7}{4})/ frac{5}{12}]* frac{2}{7}= \ \ =[( frac{7}{15} + frac{5}{15} - frac{3}{15} ) * frac{5}{4} +( frac{2}{4} - frac{7}{4})* frac{12}{5}]* frac{2}{7}= \ \ =[ frac{9}{15} * frac{5}{4} +( frac{-5}{4})* frac{12}{5}]* frac{2}{7}= \ \ =[ frac{9}{15} * frac{5}{4} -frac{5}{4}* frac{12}{5}]* frac{2}{7}= \ \ =[ frac{3}{4} -frac{12}{4}]* frac{2}{7}=- frac{9}{4} * frac{2}{7}= - frac{9}{14} [/latex]

( frac{7}{15} + frac{1}{3} - frac{1}{5} ) * frac{5}{4} +( frac{1}{2} - frac{7}{4})/ frac{5}{12}]* frac{2}{7}= \ \ ( frac{7}{15} + frac{1} {3} - frac{1}{5} )= frac{7+5-3}{15}= frac{9}{15}= frac{3}{5} \ \ frac{3}{5}* frac{5}{4} = frac{3}{4} \ \ ( frac{1}{2} - frac{7}{4})/ frac{5}{12}= frac{2-7}{4}/ frac{5}{12}= -frac{5}{4}/ frac{5}{12}= -frac{5}{4}* frac{12}{5}= -3 \ \ frac{3}{4}-3= frac{3-12}{4}= \ \ -frac{9}{4}*frac{2}{7}=-frac{9}{14}