[tex]6(3 - 2z) = 42 \\ 18 - 12z = 42 \\ - 12z + 18 - 42 = 0 \\ - z + \frac{3}{2} - 2 = 0 \\ z = - \frac{3}{2} + 2[/tex]
the answer is ....
i hope it helps u
