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b) ½a² + ½a - ½a² + 2 = ½a + 2
c) ⅓a² + ⅓ - 4/3a² + ¾a - a +a = a² + ⅓ + ¾a
d) a + 2b - 0,7a + 7b + a - b = 1,3a + 8b