To solve the equation \( 7^? \div 7^5 = 7^{12} \), we can use the property of exponents which states that \( a^m \div a^n = a^{m-n} \).
Applying this property to the left side of the equation:
\[ 7^? \div 7^5 = 7^{? - 5} \]
Now, we can rewrite the equation:
\[ 7^{? - 5} = 7^{12} \]
Since the bases are the same, we can set the exponents equal to each other:
\[ ? - 5 = 12 \]
Now, we can solve for \( ? \):
\[ ? = 12 + 5 \] \[ ? = 17 \]
Thus, the missing number is \( \boxed{17} \).
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