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= 3a² - q - a² - 5a
= 3a² - a² - q - 5a
= 2a² - q - 5a
2. (x²+3x) - (7x - 2x²)
= x² + 3x - 7x + 2x²
= x² + 2x² + 3x - 7x
= 3x² -4x
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