15
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76
its 30 because you add 8 and 7 then add it by itself or multiply it by 2**.**
(7*8)+(7+8) = 56+15 = 71
15
When you add 8 and 5 the sum will be 13. On the other hand when you add 6 and 7 the sum will be 13. That's why it's equal to 13.