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= ( 5 . (× - y) per (x + y)(x - y )) + ( 2 . (x + y) per (× - y)(x + y))
= ( 5x - 5y per x2 - y2 ) + ( 2x + 2y per x2 - y2 )
= 5x - 5y + 2x + 2y per x2 - y2
= 7x - 3y per x2 - y2