40+30= 84-50= 37+8= 72-7=
100-40= 6+35= 30+43= 63+7=
15+5+42= 48+(17-8)= 30-8-20=
73-(21+9)= 54+7-40= 15+(58-50)=
12-6= 13-8= 8+3= 15-4=
9+2= 16-7= 12-9= 11-8=
11-4= 18-8= 14-5= 17-6=
15-8= 17-10= 2+7= 14-9=
59-6= 38-3= 12-7= 5+42= 23-3+48=
53+6= 18-9= 4+45= 15-7= 64-40-3=
15-9= 50+16= 25+20= 13-6= 80-50+34=
7+40= 91-30= 71-50= 80+3= 20+8+50=
17-8= 66-5= 20+18= 17+60= 53+30-40=