Brianne solved a quadratic equation. Her work is shown below, with Step $2$ missing.
**What could Brianne have written as the result from Step $2$?**
$\begin{align}
3(x+4)^2&=48
\\\\
(x+4)^2&=16&\text{Step }1
\\\\
&&\text{Step }2
\\\\
x=-8&\text{ or }x=0&\text{Step }3
\end{align}$
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