In problem the given differential equation is a model of a damped nonlinear spring/mass system. Predict the behavior of each system as t → ∞. For each equation use a numerical solver to obtain the solution curves satisfying the given initial conditions.

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dx + x - x = 0, dt d?x dr %3D x(0) = 0, x'(0) = x(0) = -1, x'(0) = 1 %3D