(a-b)(5x-3y)-(b-a)(3x+5y)

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(a-b)(5x-3y)-(b-a)(3x+5y)
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(a-b)(5x-3y)-(b-a)(3x+5y)
(a-b)(5x-3y)-(b-a)(3x+5y)

(a-b)(5x-3y)-(b-a)(3x+5y)
(a-b)(5x-3y)-(b-a)(3x+5y)
=(a-b)(5x-3y)+(a-b)(3x+5y)
=(a-b)(5x-3y+3x+5y)
=2(a-b)(4x+y)