To solve the equation \( 7^? ÷ 7^5 = 7^{12} \), we can use the property of exponents which states that when you divide two exponential expressions with the same base, you can subtract the exponents:
\[ \frac{7^?}{7^5} = 7^{? - 5} \]
So we can rewrite the equation as:
\[ 7^{? - 5} = 7^{12} \]
Since the bases are the same, we can set the exponents equal to each other:
\[ ? - 5 = 12 \]
To find \( ? \), we add 5 to both sides:
\[ ? = 12 + 5 \] \[ ? = 17 \]
Thus, the missing number is \( \boxed{17} \).
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