When integrating x6x+3dx\displaystyle \int{x}\sqrt{{-{6}{x}+{3}}}{\left.{d}{x}\right.}, we can use the substitution u=6x+3\displaystyle {u}=-{6}{x}+{3}. What will the resulting integral be after the substitution?

\displaystyle \int   du\displaystyle {d}{u}