Unlevel flooring and laminate flooring

[Mandolin Joe]

Hi, We

We have recently knocked down a wall between our dining room and kitchen.
Both floors don't seem to be flush with each other.
The wall was a little over 2m wide.
On the floor, where the wall used to be is a ramp rather than a flat surface.
The ramp is obviously the same size of the wall thickness (approx 150mm).

The problem is that the ramp is not uniform along the length of the ramp.
What I'm saying is at one ned of the ramp, dimension A is 30mm, while at the other end, dimension A is 3 mm.

We would like to lay some laminate flooring over both rooms so I'm not sure how to tackle the issue.

 

[Mark DM]

Sounds like some grinding and slc going down but some pictures maybe with a level laid across would add some context and help to provide further advice

 

[Mandolin Joe]

***QUESTION REWORDED FOR CLARITY***

We recently knocked down a wall between kitchen and dinning room.
The floors either side of where the wall are not flush to each other all the way across where the wall has been.

On one end they are flush, but on the other end, there is about a 30 mm height difference between floors (see floor plan). This might be due to subsidence, not sure.
From one wall where they are flush, all the way across to the other end, where it isn't, the ramp increase is gradual, almost like if you were to twist a long rectangular plank, no sudden changes in the ramp.

We plan to lay some laminate flooring in both rooms but are a bit unsure about how to tackle this issue.
Using a threshold would not work because the ramp is not uniform across, wall to wall.

 

[Mark's Dad]

Self levelling compound would be the best way to go as Mark DM says.

 

[Mandolin Joe]

I think I 'll need more detail so i understand what you mean. I'm not a builder so my understanding is that you pour screed in the dining room so it levels out the dining room and make it flush with the kitchen? The floors in both the dining room and kitchen are marley tiles and may contain asbestos. I suspect I would need to break up the tiles to create a surface that the slc can bond to as I don't think it would bond to marley tiles as well.
Would this be the only option?