$$\left. \begin{array} { l } { \quad 4 ( 3 z - 6 ) = 24 } \end{array} \right.$$
$z=4$
$$3z-6=\frac{24}{4}$$
$$3z-6=6$$
$$3z=6+6$$
$$3z=12$$
$$z=\frac{12}{3}$$
$$z=4$$
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