These are three ways of saying the same thing. They emphasize that the people must obey everything that God commands them to do. Alternate translation: "If you carefully obey my laws and commands" (See: [[rc://en/ta/man/translate/figs-parallelism]])
Behaving according to the laws is spoken of as if they were to walk in the laws. Alternate translation: "If you behave according to my laws" or "if you live according to my laws" (See: [[rc://en/ta/man/translate/figs-metaphor]])