13+4=17
(12-2)+4=14
15-5=10
(17+3)-6=14
30+5=35
9+(13-5)=17
17-9=8
14-(5+7)=2
16-5=11
(11-10)+8=9
17-4=13
7+(5+3)=15
13-2=11
17-(7+4)=6
12+6=18
19-(6+5)=8
18-2=16
13+(4+3)=20
19-4=15
(16-5)+7=18
13-5+7=15
3+8+2=13
20-5-8=7
19+1-6=14
17-7+8=18
12-2+6=16
4+7-8=3
18-4-6=8
10+7-9=8
40-30+5=15
20+50+10=80