How to say in Czech: He figured it out all on his own.

English
figured it out all on his own.
Czech
Přišel na to úplně sám.
Does he like his figure?
He likes his figure.
He has to watch his figure.
He is old enough to stand on his own feet.
He had to do everything on his own.
He is not used to being on his own.
Is he learning Arabic on his own?
He has his own problems.
He started his own company.
He grows his own vegetables.

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