Then you will need to tell us what the problem really is. What you have written is ambiguous. Is it 48/[2(9+3)] or (48/2)(9+ 3)?
perhaps in your textbook it appears as \(\displaystyle \frac{48}{2(9+3)}\) (the first above) or \(\displaystyle \frac{48}{2}(9+3)\) (the second).
Can you do 48/2? What about 9+ 3? Now you want to either divide or multiply those two numbers depending on which of the two possible interpretations of what you wrote is correct.
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