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A =  3 x² - 5 x + 6 x - 10  = 3 x² + x - 10

B = 16 x² - 56 x + 49 + 48 -  8 x = 16 x² - 64 x + 97

C = 25 x² - 1 - ( 2 x² - 14 x - 3 x + 21  )

  = 25 x² - 1 - 2 x² + 17 x - 21

  = 23 x² + 17 x - 22

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