24x^2 - 72x + 7x +21
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24x² - 72x + 7x + 21 = 0
24x² - 65x + 21 = 0
24x² - 9x - 56x + 21 = 0
3x (8x - 3) - 7 (8x - 3) = 0
(3x - 7) (8x - 3) = 0
x = 7/3, 3/8
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