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ΔpΔx >= h/4pi is the main equation we use when finding uncertainty in position/momentum. I believe the other one you're talking about is Δp=mΔv. We use this one to find Δp for the main equation. The reason why there's Δv and not Δm is because mass stays constant and there's no uncertainty to mass, there's only uncertain to velocity. Hope this helps!
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