19-11= 26- 4= 99-24= 29- 8= 88-77=
50-50= 24-13= 10+20= 14+25= 31-11=
17- 7= 19-12= 88-80= 25-4= 99-23=
24-13= 15+14= 90-10= 20+8= 25+33=
18+11= 28+2= 29+1= 25+25= 26-10=
12+5= 28+11= 25+12= 23-3= 12+10=
16+13= 24+4= 19+11= 17-12= 18-8=
19-6= 29+10= 72-10= 20+30= 99-98=
12+17= 60-40= 17-17= 90-40= 16+54=
20-10= 70-50= 50-30= 60+30= 12+33=
28+6= 16+44= 20+44= 50-50= 19-18=
18-15= 88+12= 66-16= 90-3
