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a.
6a + 4b + 3a + b = 6a + 3a + 4 + b
= 9a + 5b
b.
2x² + 6x + x² - 9 = 2x² + x² + 6x - 9x
= 3x² - 3x
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a.
6a + 4b + 3a + b = 6a + 3a + 4 + b
= 9a + 5b
b.
2x² + 6x + x² - 9 = 2x² + x² + 6x - 9x
= 3x² - 3x
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