48/2(9+3)
48/2(12)
48/2x12
48/24
=
2
Parentheses - In this case, 9+3 being in the parentheses means you add these together first.
Exponents - Skip this, as there are no exponents involved.
Multiplication - After adding 9+3, you'll see that the denominator has become 2(12). Multiply these together, and your result is 24.
Division - Now the fraction has become 48/24, which is simply 2.
Addition
Subtraction
Although, seeing this problem typed in this way can cause confusion.
48/2(9+3) can mean 48 divided by the product of 2 times the sum of 9 + 3.
or
48/2(9+3) can mean the quotient of 48 and 2 times the sum of 9 + 3.
I just happen to see it as the first possibility.