President Barack Obama urged G20 countries to accelerate financial reform and strengthen public finances in a letter released on Friday ahead of the group's meeting in Toronto.

In an apparent nod toward China, Obama also stressed the importance of market-determined exchange rates to global economic strength.

The signals that flexible exchange rates send are necessary to support a strong and balanced global economy, he wrote in the letter released by the White House.

(Reporting by Jeff Mason; Editing by Doina Chiacu)

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