Which is the last operation performed when evaluating (8-2x)+4

Short Combine like terms
Remark
Just from what I see here, remove the brackets first and combine like terms second.

Discussion
8 - 2x + 4     The like therms are 8 and 4 First step
12 - 2x          That's the answer. Don't go any further. 2nd and last step

The answer you are looking for is right in front of you it’s c. 3/20