$(20$ pts$.)$ Determine the deflection at point $C$ in the middle of the cantilever beam $($where the $10$ kN load is applied$),$ starting with an expression for the moment M$($x$)$ between points $B$ and $C.$ Use $E=200GP{a}_{?}$ and $I=121{10}^{-6}{m}_{?}^4$