4-2+2+10=
14
30-30+15=
15
20-10
10
7+3-5=
5
10+10=
20
35-5-5=
25
7-1=
6
2+4+3-4=
5
10-5-4-1=
0
6-5+2=
3
6-3+3=
6
5+5+5-3=
12
5+3+10=
18
2-1+2=
3