To solve the equation \( \frac{7^?}{7^5} = 7^{12} \), we can apply the property of exponents that states \( \frac{a^m}{a^n} = a^{m-n} \).
Using this property, we rewrite the left side of the equation:
\[ \frac{7^?}{7^5} = 7^{? - 5} \]
Now, we have:
\[ 7^{? - 5} = 7^{12} \]
Since the bases (7) are the same, we can equate the exponents:
\[ ? - 5 = 12 \]
To solve for \( ? \), we add 5 to both sides:
\[ ? = 12 + 5 \]
\[ ? = 17 \]
Therefore, the missing number is
\[ \boxed{17} \]