Answer
$y=\frac{9+x}{3}$.
Work Step by Step
The given equation is
$\Rightarrow3y-x=9$
Add $x$ to each side.
$\Rightarrow3y-x+x=9+x$
Simplify.
$\Rightarrow3y=9+x$
Divide both sides by $3$.
$\Rightarrow \frac{3y}{3}=\frac{9+x}{3}$
Simplify.
$\Rightarrow y=\frac{9+x}{3}$
Hence, the rewritten literal equation is $y=\frac{9+x}{3}$.
