Easy Floor Leveling Hack: Connect Separate Rooms

I have many questions about making floor-leveling connections in separate rooms. Here is a very good example of how to make it easy!
Previous MrYoucandoityourself video: Leveling Wood Floor With Straight Edge -    • Leveling Wood Floor With Straight Edge MrY...  

Tools and materials I am using for floor leveling:
4D laser Level - https://bit.ly/2uVCPfX
Concrete Leveling tripods - https://bit.ly/2uVCPfX
Concrete Mixer for barrel - http://amzn.to/2h3CnWV
Dewalt Drill for Mixer - http://amzn.to/2i8ku75
Straight Edge 10 Ft. - http://amzn.to/2hNKhFj
Straight Edge 8 Ft. - http://amzn.to/2h3z5Dh
Concrete Finishing Trowel - http://amzn.to/2i3DMP9
Spike Roller - http://amzn.to/2hTv8iP
Foam Seal Roll - http://amzn.to/2i3ydAh
Hammer Tacker - http://amzn.to/2i3kWaL
Utility Knife - http://amzn.to/2kIvPvY
Mapei Primer L
Mapei Novoplan 2 Plus 50 lbs. / Mapei Self Leveler plus

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