$$1 \frac{ 5 }{ 9 } -(z+ \frac{ 4 }{ 9 } )= \frac{ 2 }{ 3 }$$
$z=\frac{4}{9}\approx 0.444444444$
$$1\times 9+5-9\left(z+\frac{4}{9}\right)=6$$
$$9+5-9\left(z+\frac{4}{9}\right)=6$$
$$14-9\left(z+\frac{4}{9}\right)=6$$
$$14-9z-9\times \frac{4}{9}=6$$
$$14-9z-4=6$$
$$10-9z=6$$
$$-9z=6-10$$
$$-9z=-4$$
$$z=\frac{-4}{-9}$$
$$z=\frac{4}{9}$$
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