(3x - 4)² - (3x - 2)(3x + 2) + 4x = 9x² - 24x + 16 - (9x² - 4) + 4x =
= 9x² - 24x + 16 - 9x² + 4 + 4x = 20 - 20x
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(3x - 4)² - (3x - 2)(3x + 2) + 4x = 9x² - 24x + 16 - (9x² - 4) + 4x =
= 9x² - 24x + 16 - 9x² + 4 + 4x = 20 - 20x