18-3=
16-4=
8+7=
7+5+4=
19-7=
10+8=
6+9=
15-5-4=
2+9=
15+5=
14+3=
17-4+6=
□〇□=□
+5=20
5=﹣5
10﹣4﹣=0
10﹣=2
+7=13
+=3+8
156+10 913 16-615
103+7 11+216 17-512+5
7+812 18-710 9+66+9
8+68+7 11+011-0 13-313-2
3+913 4+812 7+43+9
145+7 9+816 6+88+6