Peyton tried to evaluate an expression step by step.
$\qquad\begin{align}
&\Large\dfrac{ ~\frac{a}{b}~ }{ \frac{-c}{d}} \\\\
\\
=&\dfrac{a}{b}\div \dfrac{-c}{d}&\green{\text{Step } 1}\\\\
\\
=&\dfrac{b}{a}\cdot \dfrac{-c}{d}&\blue{\text{Step } 2}\\\\
\\
=&\:\:\:-\dfrac{bc}{ad}&\purple{\text{Step } 3} \\\\
\end{align}$
**Find Peyton's mistake.**
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