Please solve this--
Factorise the polynomial
3x(x-y)+ 2y(x-y)+ 7(y-x)
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=3x( x - y ) + 2y (x-y ) + 7 ( y -x )
= 3x²- 3xy + 2xy- 2y² + 7y- 7x
= 3x² - 2y ² -xy + 7y - 7x
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