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b) a - 2a² + 5 - 3a + 4a² - 3 = 2a²-2a-2
c) 3y² - 3y + 3y - y² + 6 = 2y²+6
d) 2/3 x² - 2.3 x + 1/3 x² - 1/3 x = 1/3x²- 1x