72/6-(12-4) 80/2/8+55 (42+28)-52/4 48/4+15*3 (75-27)*2-19 (30*3-13*6)/4
72/6-(12-4)= 12-8=6 80/2/8+55= 60 (42+28) - 52/4= 70-13=57 48/4+15*3= 12+45=57 (75-27)*2-19= 75 (30*3-13*6)/4=90-78/4=3