The Most Common Mistake This Class Will Make on This Question

I would just say like circle, consider the sign, redo this question. So we've got that one. That's good. Can I ask what's the most likely reason why this class will make a mistake on this question? They're not going to recognize that when you take away a negative, you actually have to add it. Right. And in terms of that thing can do structure, that's pretty nice. Because you got rewrite and substitute, that's the thing. And then and solve, that’s the do.