13-5= 30-9= 2+70= 7+7-6=
36+40= 86-50= 55-5= 63-9+10=
48+2= 8+20= 81+7= 21+5+6=
63-6= 47+6= 72-7= 56-(16-6)=
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)=