'(= (Counterweight_Plate_Weight ?X)
(* 0.2816
(* (Counterweight_Plate_Thickness ?X)
(- (* (Counterweight_Plate_Depth ?X)
(- (Counterweight_Between_Guiderails_Value ?X) 2))
(- (* 3.5 (- (Counterweight_Plate_Depth ?X) 5))
(* 6 (- (Counterweight_Plate_Depth ?X) 7)))))))