помогите решить пример 31,5÷1,4-(3,5×4/2/5-3,4×3/1/2)×3/1/2

31,5÷1,4-(3,5×4/2/5-3,4×3/1/2)×3/1/2=315:14-(3.5*2*5-3.4*3*2)*3*2=22.5-(3.5*10-3.4*6)*6=22.5-(35-20.4)*6=22.5-14.6*6=22.5-87.6=65.1