Subtract 2x^3 - 3 x - 6 + 8x^2 from 8x - 10 + 7x^2 - 9x^ 3
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( 8x - 10 + 7x² - 9x³ ) - ( 2x³ - 3x - 6 + 8x² )
( -9x³ + 7x² + 8x - 10 ) - ( 2x³ + 8x² - 3x - 6 )
=> -9x³ + 7x² + 8x - 10 - 2x³ -8x² + 3x + 6
=> -11x³ - x² + 11x - 4
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