Answer
$k=0$.
Work Step by Step
The given equation is
$\Rightarrow 4k=0$
Divide each side by $4$.
$\Rightarrow \frac{4k}{4}=\frac{0}{4}$
Simplify.
$\Rightarrow k=0$
Check:- $k=0$
$\Rightarrow 4(0)=0$
$\Rightarrow 0=0$
True.
Hence, the solution is $k=0$.
