self Maths Puzzle

5+5 = 10
38+20 = 1858
5+3 = 28
9+1 = 810
8+6 = 214
5+4 = 19
7+3 = ?

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self Other Question

6+3+2 = 242116
8+9+1 = 727216
5+7+4 = 505644
2+7+5 = Who am I?
2.3.4.15.12
3.4.5.28.20
4.5.6.45.30
5.6.7.a .42
6.7.8.91.56