Generate a correctly punctuated version of the following text: If the room is empty and the sound absorption level is determined mainly from the absorption of the ceiling the floor and the walls then A aceiling x Sceiling afloor x Sfloor awall x Swall where a is the sound absorption factor and S is the surface for the respective area of the room We have assumed that all the walls have the same absorption factor
If the room is empty and the sound absorption level is determined mainly from the absorption of the ceiling, the floor and the walls, then A = aceiling x Sceiling + afloor x Sfloor + awall x Swall where a is the sound absorption factor and S is the surface for the respective area of the room. We have assumed that all the walls have the same absorption factor.