$$4 z + 3 = 6 + 2 z$$
$z = \frac{3}{2} = 1\frac{1}{2} = 1.5$
$$4z+3-2z=6$$
$$2z+3=6$$
$$2z=6-3$$
$$2z=3$$
$$z=\frac{3}{2}$$
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