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m=Minital + deltaM

and x=xinital + deltax

and F=-mg

to get x=(g/k)deltaM + ((Minital)(g)/k +xinital)

(where m= mass. Minital is fixed inital mass and deltaM is additional weight added)

(where x= displacement. xinital is when no downward force is applied and deltax is displacement from unstretched position)

please explain how to get this equation

Thank you