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= 2a + 7a + 3 - 5
= 9a + (-2)
b. (4x²-x³) + (5x²-6x³+6)
= 4x² + x³ + 5x² - 6x³ + 6
= x³ - 6x³ + 4x² + 5x² + 6
= (-5x³) + 9x² + 6
Semoga membantu.. ^_^ Maaf apabila ada yang salah..