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(Reuters) -Wall Street's main indexes were mixed on Tuesday as investors parsed quarterly results from companies such as UnitedHealth and Bank of America.    

At 09:32 a.m. the Dow Jones Industrial Average fell 148.47 points, or 0.34%, to 42,916.75, the S&P 500 gained 5.04 points, or 0.09%, to 5,864.89, and the Nasdaq Composite gained 32.39 points, or 0.18%, to 18,535.07.