Please show steps to the solution and where the values come from.

$6-23.$ The beam supports a uniform dead load of $\backslash (500\backslash$mathrm$\{$lb$\}/\backslash$mathrm$\{$ft$\}\backslash )$ and a single live concentrated force of $5$ k $.$ Determine $($a$)$ the maximum negative moment at $\backslash ($ E $\backslash ),$ and $($b$)$ the maximum positive shear at $\backslash ($ E $\backslash ).$ Assume the support at $\backslash ($ D $\backslash )$ is a pin, $\backslash ($ A $\backslash )$ and $\backslash ($ C $\backslash )$ are rollers, and $\backslash ($ B $\backslash )$ is a pin.