$$8x^{2}y^{3}z-3x^{2}y^{3}z-7x^{2}y^{3}z=$$
$-2zx^{2}y^{3}$
$$5x^{2}y^{3}z-7x^{2}y^{3}z$$
$$-2x^{2}y^{3}z$$
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$-4xzy^{3}$