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= 9x^3 - 2x^3 - 15x² - 8x² + 3x + 18 x
= 7x^3 - 23x² + 21x
b) = 4x² + 4y - 4 - 6x² + 9y - 6
= 4x² - 6x² + 4y + 9y -4 -6
= -2x² + 13y -10
= 2x² -13y + 10