80-40(5+35)= 57-27:3+24= 60:3+2*6= 60:(3+2)*6= (49-42):7= (54-24):6

80-40(5+35)= -2000

57-27:3+24= 15

60:3+2*6= 14

60:(3+2)*6= 60

(49-42):7= 1

(54-24):6 = 5