21+7= 46-6= 24+50= 68-4= 22+5=
1+38= 28-6= 8+30= 5+72= 56-6=
2+87= 20+43= 87-1= 49-9= 78+20=
25+3= 4+53= 64-60= 15-9=
55+40= 30+54= 64-30= 14-6=
86-34= 60-50= 64-3= 7+6=