4-3rd6*rd3supra2*3-5rd2-7rd3*rd6 supra4*6+3+2rd6*rd3 supra3*3-4rd6-3rd2 supra6*2= 4-3rd18/6-5rd2-7rd18/24+3+2rd18/9-4rd6-3rd2/12=4-3*3rd2/6-5rd2-7*3rd2/24+3+2*3rd2/9- 4rd6-3rd2/12=4-3rd2/2-5rd2-7rd2/8+3+2rd2/3-4rd6-rd2/4=96-36rd2-120rd2-21rd2+72+16rd2-96rd6-6rd2=96-rd2(-36-120-21+16-6)+72-96rd6=168-167rd2-96rd6