If u use scientific calculations u will find that ur answer is 0. But if u use PEMDAS this is ur answer
2-4+6/2
Divide 6/3 and u get 2 then u have
2-4+2
Add 4+2 and u get 6
then subtract 6-2 and u have 4.
these are two possibilities of which one can be ur answer. 0 can be the answer in scientific way, and if u use PEMDAS u will get 4