2 + 3 = 107 + 2 = 636 + 5 = 668 + 4 = 96Then:9 + 7 = ????

Strictly speaking the equations given in the question are
incorrect. We cannot have sum of 2 and  5 as 10. However if we consider the equations
given not as normal mathematical equations but as some different method of representing
functions of two numbers 'a' and 'b' where the sign '+' represents this function, we can
see a common pattern in the equation given:

We see
that

2 + 3 = 10 = sum of 2 and 3, multiplied by
2.

7 + 2 = 63 = sum of 7 and 2, multiplied by
7.

6 + 5 = 66 = sum of 6 and 5, multiplied by
6.

8 + 4 = 86 = sum of 8 and 4, multiplied by
8.

This can be represented in general terms
as

a + b = sum of a and b, multiplied by
a.

Using this general
relationship:

9 + 7 = sum of 9 and 7, multiplied by 9 =
144