Answer
$\{-4\}$
Work Step by Step
Subtract $4$ from both sides.
$3x+4-4=-8-4$
Simplify.
$3x=-12$
Divide both sides by $3$.
$\dfrac{3x}{3}=-\dfrac{12}{3}$
Simplify.
$x=-4$
Hence, the solution to the equation is $\{-4\}$.