Claud tried to evaluate an expression step by step.
$\qquad\begin{align}
&\Large\dfrac{ ~\frac{-3}{4}~ }{ \frac5{-6}} \\\\
\\
=&\dfrac{-3}{4}\div \dfrac{5}{-6}&\green{\text{Step } 1}\\\\
\\
=&\dfrac{-3}{4}\cdot \dfrac{-6}{5}&\blue{\text{Step } 2}\\\\
\\
=&\:\:\:\dfrac{9}{10}&\purple{\text{Step } 3} \\\\
\end{align}$
**Find Claud's mistake.**
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