The "X" Factor ... {Rescatado}

Carrie: Later that night I got to thinking about the x-factor. In mathmatics, we learn that x stands for the unknown, a+b=x, but what's really unknown is what plus what equals friendship with an x. Is this an unsolvable equation? Or is it possible to transform a once passionate love into something that fits nice and easily onto the friendship shelf? I couldnt help but wonder... can you be friends with an x?