12+5= 27-9= 30+4=
3+40= 15+4= 23+3=
45+1= 25-9= 37-1=
15-9= 42-12= 18+8=
31+2= 12+5= 14+6=
28-7= 19-14= 22-2=
19-12= 14-2= 46+7=