Below we write the correct sum before the given sum:

2 + 3 = 5 | 10
7 + 2 = 9 | 63
6 + 5 = 11 | 66
8 + 4 = 12 | 96

From this it is clear that the correct sum divides the given sum and that

2 + 3 = 10 = 2(2+3)
7 + 2 = 63 = 7(7+2)
6 + 5 = 66 = 6(6+5)
8 + 4 = 96 = 8(8+4)

So it must be true that

9 + 7 = 9(9+7) = 144