To solve the equation \( \text{Blank} + (3 + 9) = (5 + 3) + 9 \), we first simplify both sides.
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Calculate \( 3 + 9 \): \[ 3 + 9 = 12 \]
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Calculate \( 5 + 3 \): \[ 5 + 3 = 8 \]
Now the equation looks like this: \[ \text{Blank} + 12 = 8 + 9 \]
- Calculate \( 8 + 9 \): \[ 8 + 9 = 17 \]
Now the equation is: \[ \text{Blank} + 12 = 17 \]
To find "Blank", we subtract 12 from both sides: \[ \text{Blank} = 17 - 12 \] \[ \text{Blank} = 5 \]
Thus, the value for blank is \( 5 \).