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If (x^3- y^3) : (x^2 + xy + y^2) = 5 : 1...

If `(x^3- y^3) : (x^2 + xy + y^2) = 5 : 1` and `(x^2 - y^2) : (x - y) = 7 : 1`, then the ratio 2x: 3y equals

A

`4:3`

B

`4:1`

C

`2:3`

D

`3:2`

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