A student solves the following equation and determines that the solution is −2. Is the student correct? Explain. 3
a + 2
−
6a
a2 − 4
=
1
a − 2

The first one, i believe, would be correct. all the others have one thing in common, and that's that they have repeating numbers. in the second one, x and y have repeating 6's and 3's, and in the third, x and y have repeating 6's as well. in the last one, there are repeating 3's. the first one has no repeating numbers.