6.75-2.75/[10%*(9.75-4+1/4)]=6.75-2.75/[0.1*(9+3/4-4+1/4]=6.75-2.75/[0.1*6]=(6+3/4)-(2+3/4)*5/3=(6+3/4)-(2*5/3+3/4*5/3)=27/4-10/3-5/4=27/4-5/4-10/3=11/2-10/3=13/6