Answer
$\dfrac{12x+5}{x-3}$
Work Step by Step
Since,in the given rational expressions denominator are same, thus take it as common and add the rational terms simply.
Given: $\dfrac{x}{x-3}+\dfrac{11x+5}{x-3}$
or, $=\dfrac{x+11x+5}{x-3}$
or, $=\dfrac{12x+5}{x-3}$
