Observe the following equations of react...

Observe the following equations of reaction of Tollen's reagent with aldehyde. How do we know that a redox reaction has taken place. Explain.
`R-CHO+2Ag(NH_3)_2*+3OH^(-) overset(Delta)rarr R-COO ^(o^+)+2Agdarr+4NH_3uarr+2H_2O`

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