Here's how I did this problem:

5x - ( x - 3 ) = 2 || (same as) 5x - 1x - 3 = 2.

4x - 3 = 2 || Add 3 to both sides.

4x = 5 || Divide each side by 4

x = 5/4

I think the answer is A

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The problem I think also lies in the question itself, not only is it a math placement but comprehension as well. It says that "The solution to 5x - ( x - 3) = 2 is also the solution to:" which means, the solution to this equation is the also the solution to one of these.

So after you solve the initial equation you have to plug it into each of the other equations until you come up with a result that = true.

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Btw, how did your 3 end up positive?

Unless I'm wrong too, its been a while.