Show me the steps to solve Consider the continuous beam shown which is of variable sectional and material properties. The moments that develop at the ends of this beam have been calculated and are shown below for each joint position.

If $\backslash ($ L $\backslash )$ is $4$ metres, $\backslash ($ w $\backslash )$ is $\backslash (14\backslash$mathrm$\{$kN$\}/\backslash$mathrm$\{$m$\}\backslash )$ and $\backslash ($ F $\backslash )$ equals $5$ kN $,$ determine the value of the final bending moment at the centre of span AB $($in kNm $,$ to $3$ significant figures$).$