$$( \frac { 3 n ^ { 2 } } { 2 } + \frac { 5 n } { 2 } )$$
$\frac{n\left(3n+5\right)}{2}$
$$\frac{3n^{2}+5n}{2}$$
$$n\left(3n+5\right)$$
$$\frac{n\left(3n+5\right)}{2}$$
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