## Elementary and Intermediate Algebra: Concepts & Applications (6th Edition)

$\dfrac{3x+5}{12}$
When adding two fractions with common denominators, we add the numerators and copy the denominator. Therefore, the given expression, $\dfrac{x}{12}+\dfrac{2x+5}{12} ,$ simplifies to \begin{array}{l}\require{cancel} \dfrac{x+2x+5}{12} \\\\= \dfrac{3x+5}{12} .\end{array}