For the given function, find the horizontal points of inflection. 
Definitions:
Probate Laws
The legal process through which a deceased person's estate is valued, beneficiaries are determined, and assets are distributed according to the deceased's will or state law.
Remaining Principal
The amount of the original loan or mortgage that has not yet been repaid.
Wal-Mart Stores
A multinational retail corporation operating a chain of hypermarkets, discount department stores, and grocery stores, headquartered in Bentonville, Arkansas.
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