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= 3(y + 3x² - xy) + 2( x² + 2xy - 3y)
= 3y + 9x² - 3xy + 2x² + 4xy - 6y
= 3y - 6y + 9x² + 2x² - 3xy + 4xy
=-3y + 11x² + xy
= 3y + 9x^2 - 3xy + 2x^2 +4xy - 6y
= -3y + 11x^2 +xy