$$x(A+2)-A-2+3(A+2)$$
$\left(A+2\right)\left(x+2\right)$
$$xA+2x-A-2+3\left(A+2\right)$$
$$xA+2x-A-2+3A+6$$
$$xA+2x+2A-2+6$$
$$xA+2x+2A+4$$
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$Ax+2x+2A+4$