3*3/4:(2*4/7-1*1/12)

[latex]3* frac{3}{4} :(2* frac{4}{7} -1*1 frac{1}{12} )= frac{9}{4} :( frac{8}{7} - frac{13}{12} )= \ \ = frac{9}{4} : frac{5}{84} = frac{9*84}{4*5} = frac{9*21}{5}= frac{189}{5} =37.8 \ \ \ frac{8}{7} - frac{13}{12} = frac{8*12}{7*12} - frac{13*7}{12*7} = frac{96}{84} - frac{91}{84} = frac{5}{84} [/latex]