Rear end shifted

Was looking at my car today and noticed my rear end was substantially over to the passenger side. When I got underneath the car I noticed a bent shackle. I assuming that’s not the only issue. When I measured the gaps between my tires and quarters, I noticed the drivers side had 1-1/2” bigger gap. Making me think it shift over 3/4”. Would the shackles being bent cause this substantial shift in the rear end? What should be done to fix/prevent this from happening.

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