Simplify: ( x+y)( 2x−3 + z) – (2x +3y)( 2x−3y)
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(2x^-3x+xz)+(2xy-3y+zy)-(2x^-3y^)
=2x^-3x+xz+2xy,-3y+zy-2x^-3y
=-3y+xz+2xy-3y+zy-2x^-3y
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