Vector Spaces & Bases · Medium problem

The matrix $A = \begin{pmatrix}-2 & 0 & 3 & 0 & 0\\-4 & 0 & 6 & 0 & 0\\2 & 0 & -3 & 0 & 0\end{pmatrix}$ has rank $1$. What is the dimension of its null space?