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