10+4= 3+11= 11+5= 9+4=
5+8= 8+7= 5+4= 9+9=
10-10= 4+3= 16+2= 10-6=
7+3= 19-3= 18-10= 7-2=
17-7+2= 9+1+2= 5-5+7= 8+7-5=