If $2^{x+1}=4^{x-7}$ and $8^{3y}=16^{-y+13}$, what is the value of $x+y$?
Question:
If $2^{x+1}=4^{x-7}$ and $8^{3y}=16^{-y+13}$, what is the value of $x+y$?
Answer:
Let's think step by step.

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If $2^{x+1}=4^{x-7}$ and $8^{3y}=16^{-y+13}$, what is the value of $x+y$?
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