(Reuters) - Motorola Solutions Inc reported a better-than-expected quarterly profit as it slashed costs, and the maker of walkie-talkies and radio systems raised its share buyback authorization by $5 billion. Motorola Solutions has about $600 million remaining from its earlier $7 billion buyback program, and the new authorization takes the total to $12 billion since July 2011. The company's total operating expenses from continuing operations fell 9 percent in the quarter ended Sept. 27, Chief Financial Officer Gino A. Bonanotte said on a conference call. ...

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