subtraction
38-21=
17
57-39=
18
35+54=
89
62+12=
74
7+20=
27
95-64=
31
50-13=
37
29+29=
58
15+7=
22
19-15=
4
68-15=
53
77-29=
48
36+28=
64
43+7=
50
124+25=
149
74-48=
26
84-49=
35
7+8=
15
12+7=
19
90-15=
75
20-8=
12
17-10=
7
51+10=
61
59+59=
118
100-7=
93