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