((3*3-7)/12)/((3*2-3)/10) + ((9*4-7*5)/40)/((7*6-5*8)/48) + (4 2/5)/((3*7+3*4)/28)= (9-7/12)/(6-3/10) + (36-35/40)/ (42-40/48) + (22/5)/(21+12/28) = (2/12)/(3/10) +(1/40)/(2/48) + (22/5)/(33/28)= 1/6*10/3 + 1/40*24+ 22/5*28/33 =
10/18 + 24/40 + 22*28/5*33= 5/9 + 6/10 +616/165= 50+54/90 + 616*6/990= 114*11/990 + 3696/990= 1254+3696/990= 4950/990= 5