86 take 4 then add 30 more
86 take 30 then add 4 more
86 take 30 then take 4 more
5+6=11
5+11=6
6+11=5
12-7=5
12-5=7
12+5=17
7+5=12
5+7=12
5+9=14
5-9=14
9-4=14
12-4=8
8+4=12
8-4=4
12-8=4
4+8=12