Convert the second-order differential equation
into a first-order system in terms of x and v, where v = dx/dt.
(a) Determine the vector field associated with the first-order system.
(b) Find all equilibrium points.
(c) Use HPGSystemSolver to sketch the associated direction field.
(d) Use the direction field to make a rough sketch of the phase portrait of the system and confirm your answer using HPGSystemSolver.
(e) Briefly describe the behavior of the solutions.
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