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= -2x² - 3x² + 3x - x + 4 - 6
= -5x² + 2x - 2
b.) 4(p² - q²) - 8(2p² + 2q²)
= 4p² - 4q² - 16p² + 16q²
= 0
c.) 7(a² - 3b² - 1) - 3a² - 2b²
= 7a² - 21b² -7 - 3a² - 2b²
= 7a² - 3a² - 21b² -2b² - 7
= 4a² - 23b² - 7
d.) 2a² + 4b² - c² - 3a² - 2b² + 3c²
= 2a² - 3a² + 4b² - 2b² - c² + 3c²
= -a² + 2b² + 2c²
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