The Student Room Group

Kc vs position of equilibrium

If Kc is a numerical value to describe the position of eq'm, how can we say that Kc does not change when pressure changes?
e.g. for the reaction 2X + 2Y --> Z
Increasing pressure shifts eq'm to the right - the side of fewer gas moles. How is Kc unaffected by this is Kc describes the position of eq'm????
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