If m and n (m > n) are the roots of the equation 7(x + 2a)² + 3a² = 5a(7x + 23a) where a > 0, then what is 3m - n equal to? - CDS Elementary Mathematics 2014 (II)

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If m and n (m > n) are the roots of the equation 7(x + 2a)² + 3a² = 5a(7x + 23a) where a > 0, then what is 3m – n equal to?