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b. 5x² - x + 25x - 5 = 5x² + 24x - 5
c. 14x - 49 -4x² + 14x = -4x² + 28x - 49
b. 5xkuadrat-x+25x-5
c.14x-49-4xkuadrat+14x = -49-4xkuadrat :)