To solve for the missing number in the expression \( \frac{7^?}{7^5} = 7^{12} \), we can use the properties of exponents.
The property states that:
\[ \frac{a^m}{a^n} = a^{m-n} \]
Applying this property to our expression, we have:
\[ \frac{7^?}{7^5} = 7^{?-5} \]
So, the equation can be rewritten as:
\[ 7^{?-5} = 7^{12} \]
Since the bases are the same, we can set the exponents equal to each other:
\[ ? - 5 = 12 \]
Now, solving for \( ? \):
\[ ? = 12 + 5 \] \[ ? = 17 \]
Thus, the missing number is \( 17 \).