Determine$\backslash$:the$\backslash$:value$\backslash$:of$\backslash$:$\backslash$int $\_2^\{14\}\backslash$:$\backslash$left$[-3$f$\backslash$left$($x$\backslash$right$)+2$g$\backslash$left$($x$\backslash$right$)\backslash$:$-$h$\backslash$left$($x$\backslash$right$)\backslash$right$]$dx$\backslash$:;given$\backslash$:$\backslash$int $\_2^\{14\}\backslash$:f$\backslash$left$($x$\backslash$right$)$dx$=28$;$\backslash$:$\backslash$int $\_2^\{14\}$g$\backslash$left$($x$\backslash$right$)$dx$=39,\backslash$:and$\backslash$:$\backslash$int $\_2^\{14\}$h$\backslash$left$($x$\backslash$right$)$dx$=8$