423*9/25*(3+3/4)-(2+4/5)*0.423*125=423*9/25*(3+3/4)-(2+4/5)*423*0.125=423*9/25*15/4-14/5*423*1/8=423*9/5*3/4-7/5*423*1/4=423*27/20-423*7/20=423*(27/20-7/20)=423
