$$9 + 4 ( x + 3 ) = 5 x - 6$$
$x=27$
$$9+4x+12=5x-6$$
$$21+4x=5x-6$$
$$21+4x-5x=-6$$
$$21-x=-6$$
$$-x=-6-21$$
$$-x=-27$$
$$x=27$$
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