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b. x (5x - 1) + 5 (5x -1) =
5x² - x + 25x - 5 =
5x² + 24x - 5
c. 7 (2x - 7) - 2x (2x - 7) =
14x - 49 - 4x² + 14x =
28x - 49 - 4x²