40+8= 79-5= 18+60= 14-6=
13-4= 8+6= 16-7= 7+8=
32-20= 9+8= 18-9= 16-9+30=
46+40= 67-50= 47+30= 90-50+42=
50+30= 20+45= 72-40= 28-4+5=