(a-b)(x-y)-(b-a)(x+y)
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(a-b)(x-y)-(b-a)(x+y)
![(a-b)(x-y)-(b-a)(x+y)](/uploads/image/z/19255991-23-1.jpg?t=%EF%BC%88a-b%EF%BC%89%EF%BC%88x-y%EF%BC%89-%EF%BC%88b-a%EF%BC%89%EF%BC%88x%2By%EF%BC%89)
(a-b)(x-y)-(b-a)(x+y),
=(a-b)(x-y)+(a-b)(x+y),
=(a-b)(x-y+x+y),
=2x(a-b).
=(a-b)(x-y)+(a-b)(x+y),
=(a-b)(x-y+x+y),
=2x(a-b).
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