$$-83x+21y-28z+6y+82x-25y+x$$
$2\left(y-14z\right)$
$$-83x+27y-28z+82x-25y+x$$
$$-x+27y-28z-25y+x$$
$$-x+2y-28z+x$$
$$2y-28z$$
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$$2\left(y-14z\right)$$