Answer
$\{2\}$.
Work Step by Step
Add numerators on the left hand side because denominators are same.
$\dfrac{2+4}{y}=3$
Simplify.
$\dfrac{6}{y}=3$
Multiply both sides by $\frac{y}{3}$.
$\dfrac{y}{3}\cdot \dfrac{6}{y}=\dfrac{y}{3}\cdot 3$
Simplify.
$2=y$
Hence, the solution to the equation is $\{2\}$.