$$-4+3z=-5-6z$$
$z=-\frac{1}{9}\approx -0.111111111$
$$-4+3z+6z=-5$$
$$-4+9z=-5$$
$$9z=-5+4$$
$$9z=-1$$
$$z=\frac{-1}{9}$$
$$z=-\frac{1}{9}$$
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