Stabilizing footage after tracked

After you have tracked footage (scale and position), you can stabilize it with the following expression:

Anchor Point: (Paste in the tracked position keyframes)
Position: (Paste in the first tracked position keyframe (Single keyframe))
Scale:

start = 300.1255; //(first scale keyframe of track)
temp = (100*start)/(thisComp.layer("BG_Tracker").transform.scale[0]);
[temp, temp]

Rotation:
StartRot = -7.7137; //(first rotation keyframe of track)
r = thisComp.layer("BG_Tracker").transform.rotation;
StartRot - r;