1 + 5 = 6
3 + 25 = 28
6 + 9 = 15
15 + 28 = 43
43 - 7 = 36

1 + 25 = 26
3 x 9 = 27
7 + 26 = 33
33 x 5 = 165
27 x 165 = 4455

3 x 7 = 21
9 + 25 = 34
34 x 5 = 170
1 + 170 = 171
21 + 171 = 192