Isabel tried to evaluate an expression step by step.
$\quad\begin{align}
&(2+8)+8\\\\
\\
=&2+(8+8)&\green{\text{Step } 1} \\\\
\\
\\
=&2+0&\blue{\text{Step } 2}\\\\
\\
\\
=&2&\purple{\text{Step } 3} \\\\
\\
\\
\end{align}$
**Find Isabel's mistake.**
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