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Rojo
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It is not exactly equivalent for all inputs, but neither are your examples. Does this serve your purposes?

# /. {{x_, y_}, z_} :> x + y +- zz^2 &

It is not exactly equivalent for all inputs, but neither are your examples. Does this serve your purposes?

# /. {x_, y_, z_} :> x + y + z &

It is not exactly equivalent for all inputs, but neither are your examples. Does this serve your purposes?

# /. {{x_, y_}, z_} :> x + y - z^2 &
Source Link
Rojo
  • 42.8k
  • 7
  • 98
  • 190

It is not exactly equivalent for all inputs, but neither are your examples. Does this serve your purposes?

# /. {x_, y_, z_} :> x + y + z &