13+7-17= 5-5+7=
7+13-15= 2+11+3=
17-2-3= 14-10+16=
18-12+11= 6+8-9=
15-12+16= 13-4+11=
2+16-6= 5+4+10=
16-7+9= 10+5-2=
15+4-7= 15-2+4=
18-9-5= 20-9+5=
5-1-4= 18-7-5=
15-12+16= 13-4+11=
2+16-6= 5+4+10=
16-7+9= 10+5-2=
15+4-7= 15-2+4=
18-9-5= 20-9+5=
5-1-4= 18-7-5=
12+2-12= 14-14+19=
2+2+15= 1+12-7=
17-17+17= 19-7+5=
5+3+7= 17-6+6=