Evaluate the integral $\displaystyle \int{\frac{{{\left.{d}{x}\right.}}}{{{\left({6}{x}+{4}\right)}^{{3}}}}}$, by making the appropriate substitution: u = 
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$\displaystyle \int{\frac{{{\left.{d}{x}\right.}}}{{{\left({6}{x}+{4}\right)}^{{3}}}}}$ =
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