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It's helpful to think of decreasing/increasing V or increasing/decreasing P in terms of Q and K. When you change the volume (basically changing the pressure), you're changing the Q value and whether the new Q is larger or lesser than K, you know which way the reaction will shift.
I saw a Khan Academy video that explained this pretty well. The main idea of it was that if having 4 moles on the reactant side can turn into 2 moles on the product side, then you have less on the products. If you increase pressure by decreasing volume, you are making the space that everything is in smaller. Therefore, to compensate for this, the reaction wants to put less things into that smaller space to make the pressure even back at to less. Because of this, the reaction will make more products because it is taking the 4 moles and turning it into two moles.
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