Answer :
2+2
4
4+4
8
8+6
14
14-4
10
10+3
13
13-2
11
11+7
18
18+6
24
24+6
30
30+6
36
36+6
42 is the answer
just group like numbers
in increasing numbers
2+2+4+6-4+3-2+7+24
2+2-2+3+4-4+6+6+6+6+6+7
2+(2-2)+3+(4-4)+(6+6+6+6+6)+(7)
2+(0)+(0)+3+(30)+7
2+30+3+7
2+30+10
40+2
42
in increasing numbers
2+2+4+6-4+3-2+7+24
2+2-2+3+4-4+6+6+6+6+6+7
2+(2-2)+3+(4-4)+(6+6+6+6+6)+(7)
2+(0)+(0)+3+(30)+7
2+30+3+7
2+30+10
40+2
42