15-7=
42-4=
35-7=
13-8=
69-30=
80-3=
16-9=
84+6=
42+30=
33-6=
87-30=
64+9=
55-6-20=
38+(36-30)=
56-(36+4)=
65+(11-4)=
83﹣68=
45+39=
56+24﹣15=
27+58= 9+66= 84-38= 90-3=
55+38= 66+14 = 63-36= 100-27=
40+30+8=
90-10-60=
26+40-4=
87-70+3=
63-(14+6)=
53-(37-7)=
15-7=
14-6=
50+4=
76-6=
80+5=
11-7=
18-9=
40-5=
25+5-9=
11-6+8=
95-5+2=
12-3+7=
20+60+8=
63-40-3=
36+30-9=
54+8-30=
42-8-30=
30+30+27=
70+28-90=
63-20+8=
10-(2+3)=
12-(9-7)=
20-(6+4)=
5+(2+8)=