The factors can be found like this, right? . . . . . Right!
So therefore: . .and . . . . . Yes!
For : . , you move 1 over,
. . so it becomes: .
. . You then divide by 3, so it equals: .
. . It then becomes: . . . . . Good!
but that's as far as I know how to do it.
Now do the same for : .
Move the -3 over: .
And this equation has no solution.
. . [ is always between -1 and +1.]
Therefore, your answer is the only solution: .