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= 2x² - 7x - 30
= (2x - 10) (2x + 3)
= (2x - 10) / 2 (2x +3)
= ( x - 5 ) (2x + 3)
x - 5 = 0 2x + 3 = 0
x = 0+5 2x = 0 - 3
x = 5 x = 3/2