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If the reaction is going to the right then the products will gain some partial pressure so it will be a positive x value for the product and a negative x value for the reactants. The same is true for the opposite in which a reaction going to the left should have a negative x value for the products and a positive x value for the reactants.
If the question gives you the pressures for all of the substances in the reaction (both the reactants and products), calculate Q and compare Q to K. If Q > K then X will be negative for the products and positive for the reactants as the reaction favors the formation of reactants. If Q < K then X will be positive for your products and negative for your reactants as the reaction favors the formation of products.
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