$$- 4 ( v + 3 ) = - 12 - 4 v$$
$v\in \mathrm{C}$
$$-4v-12=-12-4v$$
$$-4v-12+4v=-12$$
$$-12=-12$$
$$\text{true}$$
$$v\in \mathrm{C}$$
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$v\in \mathrm{R}$
$$v\in \mathrm{R}$$