I have trouble following Deans's derivation of the inverse Radon transform formula for $n=2$ on this page of his book "The Radon Transform and Some of its Applications" (see snapshot)

Formulas (3.9) and (3.10) make sense, but I can't quite see the change of variables used to get (3.11) and (3.12)?

Any insight appreciated, thanks!

p.

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