2 x square minus x minus 6
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2x^2 - x - 6 = 0
2x^2 - 4x + 3x - 6 = 0
2x ( x - 2 ) + 3 (x-2) = 0
(2x + 3) (x - 2) = 0
The roots are 2 and -3/2.
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