How to find initial pressure

Consider the equilibrium below. If K=4 and initial pressures of CO and H2O are equal, giving a total pressure of 1.5 bar at equilibrium. What was the initial pressure of CO or H2O?

CO(g)+H2O(g)↽−−⇀CO2(g)+H2(g)

I don't know how to get the initial pressures in this situation. Do I have to set up an ICE chart? I'm not sure how to start, any help would be appreciated. The answer is apparently 0.75 bar.

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