Devin tried to find the derivative of $-3x-11$ using basic differentiation rules. Here is his work:
$\begin{align}
&&&\phantom{=}\dfrac{d}{dx}(-3x-11)
\\\\
\text{Step 1}
&&&=\dfrac{d}{dx}(-3x)-\dfrac{d}{dx}(11)
\\\\
\text{Step 2}
&&&=\dfrac{d}{dx}(-3x)-0
\\\\
\text{Step 3}
&&&=-3\dfrac{d}{dx}(x)
\\\\
\text{Step 4}
&&&=-3\cdot 1
\\\\
\text{Step 5}
&&&=-3
\end{align}$
**At which step did Devin make a mistake, if at all?**
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