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v_x² = v_xo² + 2a_x (  x - x_o )    subtract  v_xo²   from both sides

v_x²  - v_xo²  = 2a_x (x - x_o)     divide both sides by 2 (x - x_o)

 [v_x²  - v_xo²  ]   /   [2 ( x - x_o ) ]   =  a_x