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48÷2(9+3) = 288
same as
48/2 * 12 = 288
or
48 * 12/2 = 288
or
48/2 * 9 + 48/2 * 3 = 288
It will always equal 288 Denominator (in this case is 2). If it was actually 2*(9+3) the entire denominator must be wrapped so.... (2*(9+3)).
I know it's late to chime in but the answer as the formula is written is 288.
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