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This is a third-order differential equation. Is it possible to convert it to a second-order one by integrating it or any other way? I think it could be done by multiplying by some additional factors.

(Sin[Sqrt[k]*\[Theta][]]*(-(q0^2*r*\[Kappa]) + 32*Pi^2*(k*r^3 - r^5*\[CapitalLambda] - 
      r^4*Derivative[1][\[ScriptF]][r] + 12*k*r*\[Eta]*\[Kappa]^2*Derivative[1][\[ScriptF]][r]^
        2 + 24*\[Eta]*\[Kappa]^2*\[ScriptF][r]^2*(2*Derivative[1][\[ScriptF]][r] + 
        r*(-2*Derivative[2][\[ScriptF]][r] + r*Derivative[3][\[ScriptF]][r])) - 
      \[ScriptF][r]*(48*r*\[Eta]*\[Kappa]^2*Derivative[1][\[ScriptF]][r]^2 + 
        12*\[Eta]*\[Kappa]^2*Derivative[1][\[ScriptF]][r]*
         (4*k - 4*r^2*Derivative[2][\[ScriptF]][r] + 
          r^3*Derivative[3][\[ScriptF]][r]) + 
        r*(r^2 - 48*k*\[Eta]*\[Kappa]^2*Derivative[2][\[ScriptF]][r] + 
          12*r^2*\[Eta]*\[Kappa]^2*Derivative[2][\[ScriptF]][r]^2 + 24*k*r*\[Eta]*\[Kappa]^2*
           Derivative[3][\[ScriptF]][r])))))/(64*Sqrt[k]*Pi^2*r^3*\[Kappa]) == 0
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