Opposite and equal means that the angle at the elbow is the same in both arms. If the throwing arm extends straight back then the glove arm should extend straight forward. If the throwing arm remains bent then the glove arm should be bent the same amount.
The orientation of the arms can differ. Thus, one arm can bent up and the other down, one up and the other horizontal, both up, both horizontal, etc.
Also the hands should be oriented in a way that mirrors each other. If you show the ball to 2B, then you should probably point the glove at home plate. If you hook the throwing hand, you should hook the glove. If you turn the throwing hand thumb down, you should turn the glove hand thumb down.
It's really important to understand that opposite and equal needs to be achieved at front foot plant. It doesn't need to be held there for any length of time. In fact, it's not really a static position as much as it is a momentary position the arm passes through. But it needs to pass through this position at front foot plant. Doing so will cause the glove side to take enough time that it gives the back side time to stay closed.