$$4(z+3)=7z+40$$
$z = -\frac{28}{3} = -9\frac{1}{3} \approx -9.333333333$
$$4z+12=7z+40$$
$$4z+12-7z=40$$
$$-3z+12=40$$
$$-3z=40-12$$
$$-3z=28$$
$$z=\frac{28}{-3}$$
$$z=-\frac{28}{3}$$
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