Michelle tried to solve an equation step by step.
$\qquad\begin{align}
t-\dfrac35&=\dfrac45\\\\
\\
t-\dfrac35+\dfrac35&=\dfrac45+\dfrac35&\green{\text{Step } 1}\\\\
\\
t&=1&\blue{\text{Step } 2}\\\\
\end{align}$
**Find Michelle's mistake.**
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