#### Answer

$z=-120$

#### Work Step by Step

$\frac{z}{4}=-23-7\rightarrow$ simplify
$\frac{z}{4}=-30\rightarrow$ multiply both sides by 4
$\frac{z}{4}\times4=-30\times4\rightarrow$ simplify
$z=-120$
Check the solution by plugging in the value for z and determine whether the resulting equation is true.
$\frac{-120}{4}=-23-7\rightarrow$ simplify
$-30=-30$
This is true so the solution is correct.