17-12=
20+30=
42-2=
15-10=
15+3=
18-8=
5+15=
20-9=
90+5=
10-7=
90-60=
20-9=
12+7=
13+7=
15+5=
12+3=
20-5 =
13-12=
4+12=
14-6=
5+15=
10-2=
20+70=
14+11=
60+8=
12+7=
19-16=
40+30=
17+3=
20-12=
65+5=
20-4=