subtract the sum of xy( - x - y - 1 ) and 2 ( xy - x²y + x ²y ) from 4 x ( xy - x ² y + xy²)
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We have
(i) 3x + 7x = (3 + 7)x = 10x
(ii) -5xy + 9xy = ( -5 + 9)xy = 4xy
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