Determine the real root of $f(x)=\frac{0\mathrm{.}8-0\mathrm{.}3x}{x}$

$($a$)$ Graphically. Please provide the commands you used as well as your outputs $($i$.$e$.$ graph and the root$).$

$($b$)$ Iteratively. Please provide the commands you used as well as your output root.