Mathematica says:(adsbygoogle = window.adsbygoogle || []).push({});

"NDSolve::alliv: "The function x[t] was specified without dependence on all the independent variables. Each function must depend on all the independent variables.""

But function x depends only on t, there is no other variable specified in the code.

What could be the problem? I attach .nb file below.

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# Problem with NDSOLVE in Mathematica

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