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