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(27 + 44 = 71 (12 + 15 = 27 (12, 15), 15 + 29 = 44 (15, 29))), ((3+n) +…
27 + 44 = 71
12 + 15 = 27
12
15
15 + 29 = 44
15
29
(3+n) + (5+n) = 8+n
3 + n =3+n
3
n
5 + n = 5+n
n
5
3 + 5 = 8
2 + 1 = 3
1
2
1 + 4 = 5
1
4
16 + 13 = 29
7 + 9 = 16
7
9
9 + 4 = 13
9
4