y2 x (2x - 3) y + x y	=	y2 x 2x - 3 + x y	(by the rule for addition with common denominator)
	=	y2 x 3x - 3 y	(simplifying)
	=	y x 3x - 3 1	(canceling y)
	=	3xy - 3y x	(simplifying)

Enter this as

3*x*y - 3*y x

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