Answer
$= \frac{5+18x}{3x^{2}}$
Work Step by Step
1) Multiply a fraction with the other denominator to obtain a common denominator between the two fractions. In this case, we only need to multiply the second fraction by $3x/3x$ to obtain a common denominator of $3x^{2}$
2) Add the fractions
$= \frac{5}{3x^{2}} + \frac{6}{x}$
$= \frac{5}{3x^{2}} + \frac{6(3x)}{3x^{2}}$
$= \frac{5+18x}{3x^{2}}$
