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If m and n ( m gt n) are the roots of th...

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

A

12a

B

14a

C

15a

D

18a

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