$$A(x-1)-(A+2)(x-1)$$
$2-2x$
$$Ax-A-\left(A+2\right)\left(x-1\right)$$
$$Ax-A-\left(Ax-A+2x-2\right)$$
$$Ax-A-Ax-\left(-A\right)-2x-\left(-2\right)$$
$$Ax-A-Ax+A-2x-\left(-2\right)$$
$$Ax-A-Ax+A-2x+2$$
$$-A+A-2x+2$$
$$-2x+2$$
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