$$( \frac{ 3 }{ 4 } { x }^{ 3 } )(x+ \frac{ 2 }{ 3 } )$$
$\frac{\left(3x+2\right)x^{3}}{4}$
$$\frac{3}{4}x^{4}+\frac{1}{2}x^{3}$$
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$\frac{3x^{4}}{4}+\frac{x^{3}}{2}$
