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= ax²y + 3y
B. (-5a + 3b + 2c) / (15a² - 9ab - 6ac)
= (-5a + 3b + 2c) / (3a) (5a - 3b - 2c)
= -(5a - 3b - 2c) / (3a) (5a - 3b - 2c)
= -1/(3a)
C. (m³ - n³) / (m² - n²)
= (m - n) (m² + mn + n²) / (m + n) (m - n)
= (m² + mn + n²) / (m + n)