# Differentiate an equation

Gold Member

## Main Question or Discussion Point

My friend came up with the following:
$2x=1 \Rightarrow \frac{d}{dx}(2x)=\frac{d}{dx}1 \Rightarrow 2=0$. Shamefully I do not see what's wrong with this reasoning!
Can someone help me? :)

LCKurtz