$$-3(-A+()+x-(2+4)-2x$$
$-x+3A-24$
$$-3\left(-A\right)-18+x-\left(2+4\right)-2x$$
$$3A-18+x-\left(2+4\right)-2x$$
$$3A-18+x-6-2x$$
$$3A-24+x-2x$$
$$3A-24-x$$
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