hardwood flooring

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I have a room in my house that used to be a carport, now turned into a living space. The existing space is covered with carpet and we want to add hardwood flooring. The problem that we have is the existing slab under the carpet has a crown in the middle of the floor. Meaning that each side is at a lower level than that of the middle sections. What can we do to level out so that we can apply hardwood?