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q = x² + 2xy -3y
3p + 2q = 3.( 3x² - xy + y ) + 2.( x² + 2xy - 3y )
= 9x² - 3xy +3y + 2x² + 4xy - 6y
= 9x² + 2x² - 3xy + 4xy + 3y - 6y
= 11x² - xy - 3y