Help would be great! All I need to know is which one doesn’t belong you don’t need to write why it’s doesn’t belong.

Answer:
There are two correct answers for this question depending on how you think of it.
3x or -3
Step-by-step explanation:
3x could be right because the rest of them are negative. But also on the other case -3 because the rest have x's and this one doesn't
Hope this helps :)
If im too late im so sorry...
Have a nice day!