A uniformly loaded fixed$-$end beam is shown.

For a uniformly distributed load of $\backslash ($ w $\backslash ),$ the beam's moment at supports and midspan is expressed as

$\backslash [$

M$=\backslash$frac$\{$w L$^\{2\}\}\{$x$\}$

$\backslash ]$

The beam is loaded beyond its elastic limit$,$ to its nominal moment capacity. At that level, the value of $\backslash ($ x $\backslash )$ in the expression is

$($Fill in the blank.$)$