How can I derive the Dirac equation from Lagrangian?

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devd
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How do i derive the Dirac equation from [itex]L_{dirac} = \overline{ψ}_α [i(γ^μ)_{αβ} - m]ψ_β ?[/itex]. I can get it for the [itex]\overline{ψ}[/itex], but I'm having trouble deriving it for [itex]ψ[/itex].
 
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