2x² + 5x - 18x² - 10X + 21=> -16x² - 5x + 21=> -16x² - 21X + 16x + 21=> -x( 16x - 21 ) + ( 16x + 21 ) => ( 16x + 21 ) ( - x + 1 ) => ( 16x + 21 ) ( 1 - x )
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