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The quotient of a number, $z$, and $21$ is $42$ . Which equation and value of $z$ represent this relationship?$\newline$$\frac{1}{21} z=42$$\newline$$21 z=42$$\newline$$\frac{1}{21} z=42$$\newline$$21 z=42$$\newline$$z=2$$\newline$$z=2$$\newline$$z=882$$\newline$$z=882$$\newline$arogress