To find the value that correctly fills in the blank so that the expressions are equivalent, we need to evaluate the left side of the equation:
First, calculate \( 32 + 72 \): \[ 32 + 72 = 104 \]
Next, calculate \( 4 + 9 \): \[ 4 + 9 = 13 \]
Now, we set the equation with the blank: \[ 104 = x \cdot 13 \]
To find \( x \), we divide both sides by \( 13 \): \[ x = \frac{104}{13} \]
Now, we perform the division: \[ 104 \div 13 = 8 \]
Thus, the value that fills in the blank is: \[ \boxed{8} \]
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