28-7+ 5
30-6-8
20-(9-8)
22+(15-7)
43-3+27=
43-(3+27)=
30+11-4=
30+(11-4)=
37-6+20=
60-4-30=
25+5-9=
42+(12-3)=
58+(26-6)=
84-(32+8)=