$$4(x-y-z)-2(x+y-z)-3(x-y+z)$$
$-x-3y-5z$
$$4x-4y-4z-2\left(x+y-z\right)-3\left(x-y+z\right)$$
$$4x-4y-4z-2x-2y+2z-3\left(x-y+z\right)$$
$$2x-4y-4z-2y+2z-3\left(x-y+z\right)$$
$$2x-6y-4z+2z-3\left(x-y+z\right)$$
$$2x-6y-2z-3\left(x-y+z\right)$$
$$2x-6y-2z-3x+3y-3z$$
$$-x-6y-2z+3y-3z$$
$$-x-3y-2z-3z$$
$$-x-3y-5z$$
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