$$10x2+9xy+8z+7x2-3x2-9x2$$
$9xy+5x_{2}+8z$
$$17x_{2}+9xy+8z-3x_{2}-9x_{2}$$
$$14x_{2}+9xy+8z-9x_{2}$$
$$5x_{2}+9xy+8z$$
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$9y$