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-> (2x² + 15x - 18) - (11x² - 17x + 29)
-> -9x² + 32x - 47
B. -5(4y² - 2y + 8) dan 4(7y² + 6y - 5)
-> (-20y² + 10y - 40) - (28y² + 24y - 20)
-> -48y² - 14y - 20
-> -2(24y² + 7y + 10)