Easy# Adding Matrices

SATSTM-EPMYV9

Free

What does the value of $z$ have to be in order to make the following equation true?

$$3\begin{bmatrix}2&-5\\\ 4&-7\end{bmatrix}=\begin{bmatrix}8&4\\\ 12&-9\end{bmatrix}+\begin{bmatrix}-2&-19\\\ 0&2z\end{bmatrix}$$