9+5= 18-2= 12+3= 13-7=
10-6= 7+4= 9-7= 12+3=
4+12= 3+7= 12-4= 16-8=
15+0= 6+8= 19-4= 6+2=
4+7+2= 6+9-10= 12-4-5=