Answer
$\left\{\dfrac{5}{4}\right\}$
Work Step by Step
Multiply both sides by $3$.
$3\cdot \dfrac{1}{3}x=3\cdot \dfrac{5}{12}$
Simplify.
$x=\dfrac{15}{12}$
$x=\dfrac{5}{4}$
Hence, the solution to the equation is $\left\{\dfrac{5}{4}\right\}$.