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